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9x-3(2x-3)=15
We move all terms to the left:
9x-3(2x-3)-(15)=0
We multiply parentheses
9x-6x+9-15=0
We add all the numbers together, and all the variables
3x-6=0
We move all terms containing x to the left, all other terms to the right
3x=6
x=6/3
x=2
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