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12x+8=6x-9
We move all terms to the left:
12x+8-(6x-9)=0
We get rid of parentheses
12x-6x+9+8=0
We add all the numbers together, and all the variables
6x+17=0
We move all terms containing x to the left, all other terms to the right
6x=-17
x=-17/6
x=-2+5/6
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