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-101=5b-7(3b+3)
We move all terms to the left:
-101-(5b-7(3b+3))=0
We calculate terms in parentheses: -(5b-7(3b+3)), so:We get rid of parentheses
5b-7(3b+3)
We multiply parentheses
5b-21b-21
We add all the numbers together, and all the variables
-16b-21
Back to the equation:
-(-16b-21)
16b+21-101=0
We add all the numbers together, and all the variables
16b-80=0
We move all terms containing b to the left, all other terms to the right
16b=80
b=80/16
b=5
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