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