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4(x+12)+2(x+12)=-18
We move all terms to the left:
4(x+12)+2(x+12)-(-18)=0
We add all the numbers together, and all the variables
4(x+12)+2(x+12)+18=0
We multiply parentheses
4x+2x+48+24+18=0
We add all the numbers together, and all the variables
6x+90=0
We move all terms containing x to the left, all other terms to the right
6x=-90
x=-90/6
x=-15
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