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3(5x+4)+5x-6=66
We move all terms to the left:
3(5x+4)+5x-6-(66)=0
We add all the numbers together, and all the variables
5x+3(5x+4)-72=0
We multiply parentheses
5x+15x+12-72=0
We add all the numbers together, and all the variables
20x-60=0
We move all terms containing x to the left, all other terms to the right
20x=60
x=60/20
x=3
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