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-5(1-8b)=315
We move all terms to the left:
-5(1-8b)-(315)=0
We add all the numbers together, and all the variables
-5(-8b+1)-315=0
We multiply parentheses
40b-5-315=0
We add all the numbers together, and all the variables
40b-320=0
We move all terms containing b to the left, all other terms to the right
40b=320
b=320/40
b=8
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