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