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12=x-5=31+3x
We move all terms to the left:
12-(x-5)=0
We get rid of parentheses
-x+5+12=0
We add all the numbers together, and all the variables
-1x+17=0
We move all terms containing x to the left, all other terms to the right
-x=-17
x=-17/-1
x=+17
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