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20x-80=10x+120
We move all terms to the left:
20x-80-(10x+120)=0
We get rid of parentheses
20x-10x-120-80=0
We add all the numbers together, and all the variables
10x-200=0
We move all terms containing x to the left, all other terms to the right
10x=200
x=200/10
x=20
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