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6(2x+40)=-12
We move all terms to the left:
6(2x+40)-(-12)=0
We add all the numbers together, and all the variables
6(2x+40)+12=0
We multiply parentheses
12x+240+12=0
We add all the numbers together, and all the variables
12x+252=0
We move all terms containing x to the left, all other terms to the right
12x=-252
x=-252/12
x=-21
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