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X+9=8X+12
We move all terms to the left:
X+9-(8X+12)=0
We get rid of parentheses
X-8X-12+9=0
We add all the numbers together, and all the variables
-7X-3=0
We move all terms containing X to the left, all other terms to the right
-7X=3
X=3/-7
X=-3/7
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