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84+7x=120+4x
We move all terms to the left:
84+7x-(120+4x)=0
We add all the numbers together, and all the variables
7x-(4x+120)+84=0
We get rid of parentheses
7x-4x-120+84=0
We add all the numbers together, and all the variables
3x-36=0
We move all terms containing x to the left, all other terms to the right
3x=36
x=36/3
x=12
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