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21=7(b-91)
We move all terms to the left:
21-(7(b-91))=0
We calculate terms in parentheses: -(7(b-91)), so:We get rid of parentheses
7(b-91)
We multiply parentheses
7b-637
Back to the equation:
-(7b-637)
-7b+637+21=0
We add all the numbers together, and all the variables
-7b+658=0
We move all terms containing b to the left, all other terms to the right
-7b=-658
b=-658/-7
b=+94
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