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8x-4=x+12
We move all terms to the left:
8x-4-(x+12)=0
We get rid of parentheses
8x-x-12-4=0
We add all the numbers together, and all the variables
7x-16=0
We move all terms containing x to the left, all other terms to the right
7x=16
x=16/7
x=2+2/7
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