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X-15=2X-30
We move all terms to the left:
X-15-(2X-30)=0
We get rid of parentheses
X-2X+30-15=0
We add all the numbers together, and all the variables
-1X+15=0
We move all terms containing X to the left, all other terms to the right
-X=-15
X=-15/-1
X=+15
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