X-120=40-7x

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Solution for X-120=40-7x equation: 



X-120=40-7X

We move all terms to the left:

X-120-(40-7X)=0

We add all the numbers together, and all the variables

X-(-7X+40)-120=0

We get rid of parentheses

X+7X-40-120=0

We add all the numbers together, and all the variables

8X-160=0

We move all terms containing X to the left, all other terms to the right

8X=160

X=160/8

X=20

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