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12x-15=8x+31
We move all terms to the left:
12x-15-(8x+31)=0
We get rid of parentheses
12x-8x-31-15=0
We add all the numbers together, and all the variables
4x-46=0
We move all terms containing x to the left, all other terms to the right
4x=46
x=46/4
x=11+1/2
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