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15x-3(4x+15)=15
We move all terms to the left:
15x-3(4x+15)-(15)=0
We multiply parentheses
15x-12x-45-15=0
We add all the numbers together, and all the variables
3x-60=0
We move all terms containing x to the left, all other terms to the right
3x=60
x=60/3
x=20
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