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-3x+3(2x+1)=15
We move all terms to the left:
-3x+3(2x+1)-(15)=0
We multiply parentheses
-3x+6x+3-15=0
We add all the numbers together, and all the variables
3x-12=0
We move all terms containing x to the left, all other terms to the right
3x=12
x=12/3
x=4
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