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88=-4(5b-7)
We move all terms to the left:
88-(-4(5b-7))=0
We calculate terms in parentheses: -(-4(5b-7)), so:We get rid of parentheses
-4(5b-7)
We multiply parentheses
-20b+28
Back to the equation:
-(-20b+28)
20b-28+88=0
We add all the numbers together, and all the variables
20b+60=0
We move all terms containing b to the left, all other terms to the right
20b=-60
b=-60/20
b=-3
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