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15x-3(3x+12)=6
We move all terms to the left:
15x-3(3x+12)-(6)=0
We multiply parentheses
15x-9x-36-6=0
We add all the numbers together, and all the variables
6x-42=0
We move all terms containing x to the left, all other terms to the right
6x=42
x=42/6
x=7
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