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3(x+6)+3(x+30)=12
We move all terms to the left:
3(x+6)+3(x+30)-(12)=0
We multiply parentheses
3x+3x+18+90-12=0
We add all the numbers together, and all the variables
6x+96=0
We move all terms containing x to the left, all other terms to the right
6x=-96
x=-96/6
x=-16
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