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165=-5(-8b-1)
We move all terms to the left:
165-(-5(-8b-1))=0
We calculate terms in parentheses: -(-5(-8b-1)), so:We get rid of parentheses
-5(-8b-1)
We multiply parentheses
40b+5
Back to the equation:
-(40b+5)
-40b-5+165=0
We add all the numbers together, and all the variables
-40b+160=0
We move all terms containing b to the left, all other terms to the right
-40b=-160
b=-160/-40
b=+4
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