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3x+3(2x+4)=66
We move all terms to the left:
3x+3(2x+4)-(66)=0
We multiply parentheses
3x+6x+12-66=0
We add all the numbers together, and all the variables
9x-54=0
We move all terms containing x to the left, all other terms to the right
9x=54
x=54/9
x=6
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