91=7(5+b)

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Solution for 91=7(5+b) equation: 



91=7(5+b)

We move all terms to the left:

91-(7(5+b))=0

We add all the numbers together, and all the variables

-(7(b+5))+91=0



We calculate terms in parentheses: -(7(b+5)), so:

7(b+5)

We multiply parentheses

7b+35

Back to the equation:

-(7b+35)



We get rid of parentheses

-7b-35+91=0

We add all the numbers together, and all the variables

-7b+56=0

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

-7b=-56

b=-56/-7

b=+8

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