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-3b+4(1+2b)=-23-4b=
We move all terms to the left:
-3b+4(1+2b)-(-23-4b)=0
We add all the numbers together, and all the variables
-3b+4(2b+1)-(-4b-23)=0
We multiply parentheses
-3b+8b-(-4b-23)+4=0
We get rid of parentheses
-3b+8b+4b+23+4=0
We add all the numbers together, and all the variables
9b+27=0
We move all terms containing b to the left, all other terms to the right
9b=-27
b=-27/9
b=-3
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