When does a linear equation of one variable change sign When does the equation of one variable change sign, for example, why does (20-x) in 4x-3 (20-x) = 3 change sign

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1. Sign problem of inequality for linear equation of one variable Don't tell me to multiply or divide on both sides 2X-1〈4X+13 2X-4X〈13+1 -2X〈14 How to see X-7? Teach me. I just don't understand the sign. I can do the equation
2. Mathematical equation of one variable, for example, 5Y = 50 + 4Y, when the solution contains unknowns on the left, how does its sign change when it moves over People's education press grade 7 Volume 1 mathematics Chapter 5 equation of one dollar, because I have to do homework
3. Steps of rational addition and subtraction?
4. The general steps of the mixed operation of addition and subtraction of rational numbers are: (1)________ ;(2)_________ ;(3)________ _______ ;(4)__________________
5. How to calculate the mixed operation of addition and subtraction of rational numbers? Example: 2 1 — + （— —）— 1 + — 3 5 3
6. 50 rational number addition and subtraction mixed operation problem + + to answer! Urgent
7. Rational number addition and subtraction in junior high school (addition) （-25）+34+156+（-65）=100 （-64）+17+（-23）+68=（-2）（-42）+57+（-84）+（-23）=（-92） subtraction （-3）-（-7）=10 （-10）-3=（-13） 33-（-27）=60 Are these questions right? Addition of rational numbers is the addition of different numbers, the decrease of sign follows the decrease of sign. Subtraction is the opposite of subtracting a number equal to the addition of this number
8. In the football round robin, if the red team wins the yellow team by 4:1, the yellow team wins the blue team by 1:0, and the blue team wins the red team by 1:0, then the net winning goals of the red team, the yellow team and the blue team are () A. 2，-2，0B. 4，2，1C. 3，-2，0D. 4，-2，1
9. Addition and subtraction of rational numbers in the first semester of junior high school This is the second sub problem of the seventh question on page seven of the exercise book of rational number addition and subtraction in the first semester of this year!
10. What's the difference between the result of his calculation and the correct answer? What's the difference between the result of his calculation and the correct answer? What's the difference between the result of his calculation and the correct answer when he miscalculated 17 * (M + 0.3) into 17 * m + 0.3? What's the difference between the result of his calculation and the correct answer when he miscalculated 17 * (M + 0.3) into 17 * m + 0.3? What's the difference between the result of his calculation and the correct answer when he miscalculated 17 * (M + 0.3) into 17 * m + 0.3? What's the difference between the result of his calculation and the correct answer when he miscalculated 17 * (M + 0.3) into 17 * m + 0.3, What is the difference between his calculation result and the correct answer? What is the difference between his calculation result and the correct answer?
11. What is the law of the sign change of mathematics without bracket in the first volume of junior high school
12. Do you want to change symbols when moving items? Like 3x-7 + 7 = 3-2x-6, I'm bad at math. I don't know anything about symbols
13. 1, 2, 3, 4, 5 = 4 can be added with operation symbols in brackets
14. 1 what, 2 what, 3 what, 4 what, 5 what = 10 with appropriate operation symbols and brackets
15. According to the requirement of operation result, add operation symbol and bracket 1 / 20.43/101/50.1 = 100.30.30.30.30.30.3 = 0 0.3 0.3 0.3 0.3 0.3=1 0.3 0.3 0.3 0.3 0.3=2 0.3 0.3 0.3 0.3 0.3=4
16. Five nines with appropriate symbols are 73
17. 5 what 5 what 5 what 5 what 5 equals 9
18. What symbol in the middle of 9 7 5 4 is equal to 24 9 7 5 4 is equal to 24
19. 1/2,1/3,1/4,1/5,…… 1 / 90, 1 / 91, pick out ten numbers, add the sign, and their sum is - 1
20. 1 / 2, 1 / 3, 1 / 4, 1 / 5... 1 / 90, 1 / 91, choose 10 numbers from them, add a sign to make the sum equal to - 1