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-4(b+4)-3b+32=21
We move all terms to the left:
-4(b+4)-3b+32-(21)=0
We add all the numbers together, and all the variables
-3b-4(b+4)+11=0
We multiply parentheses
-3b-4b-16+11=0
We add all the numbers together, and all the variables
-7b-5=0
We move all terms containing b to the left, all other terms to the right
-7b=5
b=5/-7
b=-5/7
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