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9x-(4x-15)=39
We move all terms to the left:
9x-(4x-15)-(39)=0
We get rid of parentheses
9x-4x+15-39=0
We add all the numbers together, and all the variables
5x-24=0
We move all terms containing x to the left, all other terms to the right
5x=24
x=24/5
x=4+4/5
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