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3(3x-1)=3x+15
We move all terms to the left:
3(3x-1)-(3x+15)=0
We multiply parentheses
9x-(3x+15)-3=0
We get rid of parentheses
9x-3x-15-3=0
We add all the numbers together, and all the variables
6x-18=0
We move all terms containing x to the left, all other terms to the right
6x=18
x=18/6
x=3
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