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3x+2(-6x+12)=-66
We move all terms to the left:
3x+2(-6x+12)-(-66)=0
We add all the numbers together, and all the variables
3x+2(-6x+12)+66=0
We multiply parentheses
3x-12x+24+66=0
We add all the numbers together, and all the variables
-9x+90=0
We move all terms containing x to the left, all other terms to the right
-9x=-90
x=-90/-9
x=+10
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