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X-40=2X-120
We move all terms to the left:
X-40-(2X-120)=0
We get rid of parentheses
X-2X+120-40=0
We add all the numbers together, and all the variables
-1X+80=0
We move all terms containing X to the left, all other terms to the right
-X=-80
X=-80/-1
X=+80
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