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X+40=2X-70
We move all terms to the left:
X+40-(2X-70)=0
We get rid of parentheses
X-2X+70+40=0
We add all the numbers together, and all the variables
-1X+110=0
We move all terms containing X to the left, all other terms to the right
-X=-110
X=-110/-1
X=+110
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