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