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5(b+4)=-20
We move all terms to the left:
5(b+4)-(-20)=0
We add all the numbers together, and all the variables
5(b+4)+20=0
We multiply parentheses
5b+20+20=0
We add all the numbers together, and all the variables
5b+40=0
We move all terms containing b to the left, all other terms to the right
5b=-40
b=-40/5
b=-8
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