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13+4(b+1)=-3
We move all terms to the left:
13+4(b+1)-(-3)=0
We add all the numbers together, and all the variables
4(b+1)+16=0
We multiply parentheses
4b+4+16=0
We add all the numbers together, and all the variables
4b+20=0
We move all terms containing b to the left, all other terms to the right
4b=-20
b=-20/4
b=-5
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