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X+2=2X-40=
We move all terms to the left:
X+2-(2X-40)=0
We get rid of parentheses
X-2X+40+2=0
We add all the numbers together, and all the variables
-1X+42=0
We move all terms containing X to the left, all other terms to the right
-X=-42
X=-42/-1
X=+42
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