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21+5(b+7)=-54
We move all terms to the left:
21+5(b+7)-(-54)=0
We add all the numbers together, and all the variables
5(b+7)+75=0
We multiply parentheses
5b+35+75=0
We add all the numbers together, and all the variables
5b+110=0
We move all terms containing b to the left, all other terms to the right
5b=-110
b=-110/5
b=-22
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