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x+140=2x-80
We move all terms to the left:
x+140-(2x-80)=0
We get rid of parentheses
x-2x+80+140=0
We add all the numbers together, and all the variables
-1x+220=0
We move all terms containing x to the left, all other terms to the right
-x=-220
x=-220/-1
x=+220
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