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X-13+15=2X+15
We move all terms to the left:
X-13+15-(2X+15)=0
We add all the numbers together, and all the variables
X-(2X+15)+2=0
We get rid of parentheses
X-2X-15+2=0
We add all the numbers together, and all the variables
-1X-13=0
We move all terms containing X to the left, all other terms to the right
-X=13
X=13/-1
X=-13
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