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12x+31=5x-11
We move all terms to the left:
12x+31-(5x-11)=0
We get rid of parentheses
12x-5x+11+31=0
We add all the numbers together, and all the variables
7x+42=0
We move all terms containing x to the left, all other terms to the right
7x=-42
x=-42/7
x=-6
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