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X+29=2X+31
We move all terms to the left:
X+29-(2X+31)=0
We get rid of parentheses
X-2X-31+29=0
We add all the numbers together, and all the variables
-1X-2=0
We move all terms containing X to the left, all other terms to the right
-X=2
X=2/-1
X=-2
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