7x-120=-3x

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Solution for 7x-120=-3x equation: 



7x-120=-3x

We move all terms to the left:

7x-120-(-3x)=0

We get rid of parentheses

7x+3x-120=0

We add all the numbers together, and all the variables

10x-120=0

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

10x=120

x=120/10

x=12

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