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x=-120+4x
We move all terms to the left:
x-(-120+4x)=0
We add all the numbers together, and all the variables
x-(4x-120)=0
We get rid of parentheses
x-4x+120=0
We add all the numbers together, and all the variables
-3x+120=0
We move all terms containing x to the left, all other terms to the right
-3x=-120
x=-120/-3
x=+40
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