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9x-(5x-12)=39
We move all terms to the left:
9x-(5x-12)-(39)=0
We get rid of parentheses
9x-5x+12-39=0
We add all the numbers together, and all the variables
4x-27=0
We move all terms containing x to the left, all other terms to the right
4x=27
x=27/4
x=6+3/4
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