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8(2b+3)=40
We move all terms to the left:
8(2b+3)-(40)=0
We multiply parentheses
16b+24-40=0
We add all the numbers together, and all the variables
16b-16=0
We move all terms containing b to the left, all other terms to the right
16b=16
b=16/16
b=1
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