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X+1=2X-39
We move all terms to the left:
X+1-(2X-39)=0
We get rid of parentheses
X-2X+39+1=0
We add all the numbers together, and all the variables
-1X+40=0
We move all terms containing X to the left, all other terms to the right
-X=-40
X=-40/-1
X=+40
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