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12x-8=9x+8
We move all terms to the left:
12x-8-(9x+8)=0
We get rid of parentheses
12x-9x-8-8=0
We add all the numbers together, and all the variables
3x-16=0
We move all terms containing x to the left, all other terms to the right
3x=16
x=16/3
x=5+1/3
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