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9x+12=6x+39
We move all terms to the left:
9x+12-(6x+39)=0
We get rid of parentheses
9x-6x-39+12=0
We add all the numbers together, and all the variables
3x-27=0
We move all terms containing x to the left, all other terms to the right
3x=27
x=27/3
x=9
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