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12x-7=4x+8
We move all terms to the left:
12x-7-(4x+8)=0
We get rid of parentheses
12x-4x-8-7=0
We add all the numbers together, and all the variables
8x-15=0
We move all terms containing x to the left, all other terms to the right
8x=15
x=15/8
x=1+7/8
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