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3x+12=9x-15
We move all terms to the left:
3x+12-(9x-15)=0
We get rid of parentheses
3x-9x+15+12=0
We add all the numbers together, and all the variables
-6x+27=0
We move all terms containing x to the left, all other terms to the right
-6x=-27
x=-27/-6
x=4+1/2
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