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4(2b+3)=20
We move all terms to the left:
4(2b+3)-(20)=0
We multiply parentheses
8b+12-20=0
We add all the numbers together, and all the variables
8b-8=0
We move all terms containing b to the left, all other terms to the right
8b=8
b=8/8
b=1
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