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15x-(3x-9)=93
We move all terms to the left:
15x-(3x-9)-(93)=0
We get rid of parentheses
15x-3x+9-93=0
We add all the numbers together, and all the variables
12x-84=0
We move all terms containing x to the left, all other terms to the right
12x=84
x=84/12
x=7
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