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91=7(b+8)
We move all terms to the left:
91-(7(b+8))=0
We calculate terms in parentheses: -(7(b+8)), so:We get rid of parentheses
7(b+8)
We multiply parentheses
7b+56
Back to the equation:
-(7b+56)
-7b-56+91=0
We add all the numbers together, and all the variables
-7b+35=0
We move all terms containing b to the left, all other terms to the right
-7b=-35
b=-35/-7
b=+5
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