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3x+4(3x-6)=66
We move all terms to the left:
3x+4(3x-6)-(66)=0
We multiply parentheses
3x+12x-24-66=0
We add all the numbers together, and all the variables
15x-90=0
We move all terms containing x to the left, all other terms to the right
15x=90
x=90/15
x=6
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