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12+31=31x+12
We move all terms to the left:
12+31-(31x+12)=0
We add all the numbers together, and all the variables
-(31x+12)+43=0
We get rid of parentheses
-31x-12+43=0
We add all the numbers together, and all the variables
-31x+31=0
We move all terms containing x to the left, all other terms to the right
-31x=-31
x=-31/-31
x=1
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