X-120=87-8x

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Solution for X-120=87-8x equation: 



X-120=87-8X

We move all terms to the left:

X-120-(87-8X)=0

We add all the numbers together, and all the variables

X-(-8X+87)-120=0

We get rid of parentheses

X+8X-87-120=0

We add all the numbers together, and all the variables

9X-207=0

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

9X=207

X=207/9

X=23

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