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140=20x-120
We move all terms to the left:
140-(20x-120)=0
We get rid of parentheses
-20x+120+140=0
We add all the numbers together, and all the variables
-20x+260=0
We move all terms containing x to the left, all other terms to the right
-20x=-260
x=-260/-20
x=+13
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