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4(a+12)=-8
We move all terms to the left:
4(a+12)-(-8)=0
We add all the numbers together, and all the variables
4(a+12)+8=0
We multiply parentheses
4a+48+8=0
We add all the numbers together, and all the variables
4a+56=0
We move all terms containing a to the left, all other terms to the right
4a=-56
a=-56/4
a=-14
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