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8x+9=12x-8
We move all terms to the left:
8x+9-(12x-8)=0
We get rid of parentheses
8x-12x+8+9=0
We add all the numbers together, and all the variables
-4x+17=0
We move all terms containing x to the left, all other terms to the right
-4x=-17
x=-17/-4
x=4+1/4
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