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80+55x=120+35x
We move all terms to the left:
80+55x-(120+35x)=0
We add all the numbers together, and all the variables
55x-(35x+120)+80=0
We get rid of parentheses
55x-35x-120+80=0
We add all the numbers together, and all the variables
20x-40=0
We move all terms containing x to the left, all other terms to the right
20x=40
x=40/20
x=2
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