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135=-5(8-5b)
We move all terms to the left:
135-(-5(8-5b))=0
We add all the numbers together, and all the variables
-(-5(-5b+8))+135=0
We calculate terms in parentheses: -(-5(-5b+8)), so:We get rid of parentheses
-5(-5b+8)
We multiply parentheses
25b-40
Back to the equation:
-(25b-40)
-25b+40+135=0
We add all the numbers together, and all the variables
-25b+175=0
We move all terms containing b to the left, all other terms to the right
-25b=-175
b=-175/-25
b=+7
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