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X+8=2X-13
We move all terms to the left:
X+8-(2X-13)=0
We get rid of parentheses
X-2X+13+8=0
We add all the numbers together, and all the variables
-1X+21=0
We move all terms containing X to the left, all other terms to the right
-X=-21
X=-21/-1
X=+21
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