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X+21=2X+32
We move all terms to the left:
X+21-(2X+32)=0
We get rid of parentheses
X-2X-32+21=0
We add all the numbers together, and all the variables
-1X-11=0
We move all terms containing X to the left, all other terms to the right
-X=11
X=11/-1
X=-11
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