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X+5=2X+13
We move all terms to the left:
X+5-(2X+13)=0
We get rid of parentheses
X-2X-13+5=0
We add all the numbers together, and all the variables
-1X-8=0
We move all terms containing X to the left, all other terms to the right
-X=8
X=8/-1
X=-8
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