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12+4(b-3)=-8
We move all terms to the left:
12+4(b-3)-(-8)=0
We add all the numbers together, and all the variables
4(b-3)+20=0
We multiply parentheses
4b-12+20=0
We add all the numbers together, and all the variables
4b+8=0
We move all terms containing b to the left, all other terms to the right
4b=-8
b=-8/4
b=-2
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