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6x-12=9x-39
We move all terms to the left:
6x-12-(9x-39)=0
We get rid of parentheses
6x-9x+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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