12+x＝1          x−57＝12          x+23＝1011．

12+x＝1          x−57＝12          x+23＝1011．

（1）12+x=1，      12+x-12=1-12，            x=12；（2）x-57=12，  x-57+57=12+57，     &nb...

3x = 54 solve equation and check calculation

3x=54
3x÷＝54 ÷3
x=18
18×3=54

Solving equation: 8.6x-5.3x = 6.93 (checking calculation)

8.6x-5.3x=6.93
3.3x=6.93
x=6.93÷3.3
x=2.1
checking calculation:
Left = 8.6x2.1-5.3x2.1 = 6.93 = right
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X / - 2 = x + 1 / 4

-1/2x=x+1/4
-1/2x-x=1/4
-3/2x=1/4
x=-1/6

How to solve the equation [X-12] / 6 = [x = 11] / 7

Take 42 on both sides
7(x-12)=6(x+11)
7x-7×12=6x+6×11
7x-84=6x+66
7x-6x=66+84
x=150

The sum of solving equation 3 × x minus 7 is equal to 0.6

3x-7 = 0.6
3X＝7．6
X＝7．6÷3
X＝76／3

How to solve the equation of 3 / 4:5 / 8 = 5 / 12: x
Dad and his friends are partners in business. Dad invests 16000 yuan and his friends 12000 yuan. A year later, they make a profit of 14000 yuan. How should dad and his friends share the money?
I bought 15 stamps with 12 yuan for 1 yuan stamps and 50 cents stamps. How many stamps did I buy for each?

3/4：5/8＝5/12：x
3/4X=5/8×5/12
X=5/8×5/12÷3/4
X=25/72

6 (x + 5. 6) = 12. 8

1.6(x+5.6)=12.8
1.6x+8.96=12.8
1.6x=12.8-8.96
1.6x=3.84
x=2.4

Solution equation: x + 3 / 8 = 7 / 72]

x+3/8=7/72
x=7/72-3/8
x=7/72-27/72
x=-20/72
x=-5/18

X-1 / 8 + 3 / 20 = 1.25 how to solve the equation

x-1/8+3/20=1.25 → x-0.125+0.15=1.25 → x=1.25+0.125 - 0.15=1.225