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12x+5=8x-31
We move all terms to the left:
12x+5-(8x-31)=0
We get rid of parentheses
12x-8x+31+5=0
We add all the numbers together, and all the variables
4x+36=0
We move all terms containing x to the left, all other terms to the right
4x=-36
x=-36/4
x=-9
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