Equation: how to solve 2x + 3x = 60? How to solve 3.6x-2.8x = 12?

2X＋3X＝60
5X=60
X=60/5
X=12
3.6X-2.8X=12
0.8X=12
X=12/0.8
X=15

RELATED INFORMATIONS

1. What is 1.225 + 2.225 + 3.225 +. + 50.225? I'm waiting to use it. I'd better tell the rules. I'll do it later Another question: (2008-1) + (2007-2) + (2006-3) +... (1005-1004) also tell me the rules and answers
2. In the rectangular coordinate system, there are four points a (- 8, 3), B (- 4, 5), C (0, n), D (m, 0). When the perimeter of the quadrilateral ABCD is the shortest, we can find the value of Mn
3. What's seven thirty minutes minus thirty-four minutes
4. Find the slope, inclination angle and intercept on the Y-axis of the following line 1.2x + y + 3 = 0.2.x5-y4 = 0.3.x-2y = 0.4.x = y
5. How to solve x-0.36x = 16 X-0.36X=16 X-0.36X=16 How does (1-0.36) x = 16 (the "1" in this place) increase 0.64x=16 x=25
6. On the slope of a straight line If the slope of a straight line is less than - 1, why is the range of inclination angle not 90 to 135? Is it 90 to 135 or 135 to 180? The college entrance examination will be held tomorrow
7. If FX = 1 / 3x ^ 3-F (1) x ^ 2 + 2x + 5, then f (2)?
8. Let f (x) defined on R satisfy f (x + y) = f (X-Y) = 2F (x) f (y) and f (π / 2) = 0 for any x, y ∈ R If f (0) ≠ 0, try to find f (π), Get rid of talking in detail. If I speak well, I will understand it after reading it once or twice. I will add at least 50 points Let f (x) defined on R satisfy f (x + y) + F (X-Y) = 2F (x) f (y) and f (π / 2) = 0 for any x, y ∈ R, If f (0) ≠ 0, try to find f (π), There's a little mistake on it. It's not an equal sign, it's a plus sign. I understand it after one or two times. I'll add at least 50 points
9. The following calculation is correct: A: 3Y / X △ 3xy = x ^ 2 B: 3Y / x ^ 2 △ X / 3Y = 1 / X C: X △ y * 1 / y = x D: A / A ^ 2-1 * A-1 / a = 1 / A + 1
10. The following statement is correct () A. When two numbers are added, the sum is greater than any addend B. when two numbers with different signs are added, the sum is less than any addend C. when two numbers with equal absolute value are added, the sum must be equal to zero D. when two numbers are added, the sign of the larger addend is taken as the sign of the result
11. Given that the coordinates of point a are (0.6,0.8), rotate OA anticlockwise around the origin of coordinates by 2 / 3 to OA, then the coordinates of point a are (0.6,0.8)__
12. if X@Y=X+ (x + 1) + (x + 2) +... + (x + Y-1), where x and y are natural numbers, and 1@50 The value of
13. 10. Y is two different numbers selected from the first 500 natural numbers, and X is greater than y, 1. Find the maximum value of X + Y / X-Y, 2. Find the minimum value of X + Y / X-Y
14. Let X and y be two different numbers selected from the 500 natural numbers from 1 to 500, then the maximum value of (x + y) / (X-Y) is () A. 1000B. 990C. 999D. 998
15. X and y are two different numbers selected from natural numbers within 50. Find the maximum value of X + y of X-Y
16. X + y + Z = 14, X '+ y' + Z '= 15, (x-x') + (y + y ') + Z * Z' = 16, given that XYZ is a natural number, find the value of X, y, Z? X ', y', Z 'can also be a, B, C, which are unknowns··
17. 10> Y > Z, n is a natural number, 1 / (X-Y) + 2 / (Y-Z) > = n / (x-z), the maximum value of n is
18. It is known that in the system of equations x + y = m and 2x-y = 6, XY is less than 0, and XY is an integer?
19. If M and N are opposite to each other, X is the smallest nonnegative number and Y is the smallest positive integer, find the value of (M + n) XY + y-x
20. Given x = 3, y = 1 / 3, find the value of x ^ 2n * (XY ^ n + 1) ^ 2