81=9(b-1)

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Solution for 81=9(b-1) equation: 



81=9(b-1)

We move all terms to the left:

81-(9(b-1))=0



We calculate terms in parentheses: -(9(b-1)), so:

9(b-1)

We multiply parentheses

9b-9

Back to the equation:

-(9b-9)



We get rid of parentheses

-9b+9+81=0

We add all the numbers together, and all the variables

-9b+90=0

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

-9b=-90

b=-90/-9

b=+10

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