21=7(b-85)

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Solution for 21=7(b-85) equation: 



21=7(b-85)

We move all terms to the left:

21-(7(b-85))=0



We calculate terms in parentheses: -(7(b-85)), so:

7(b-85)

We multiply parentheses

7b-595

Back to the equation:

-(7b-595)



We get rid of parentheses

-7b+595+21=0

We add all the numbers together, and all the variables

-7b+616=0

We move all terms containing b to the left, all other terms to the right

-7b=-616

b=-616/-7

b=+88

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