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-3x+12=8x-9
We move all terms to the left:
-3x+12-(8x-9)=0
We get rid of parentheses
-3x-8x+9+12=0
We add all the numbers together, and all the variables
-11x+21=0
We move all terms containing x to the left, all other terms to the right
-11x=-21
x=-21/-11
x=1+10/11
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