b=0.75(21-b)

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Solution for b=0.75(21-b) equation: 



b=0.75(21-b)

We move all terms to the left:

b-(0.75(21-b))=0

We add all the numbers together, and all the variables

b-(0.75(-1b+21))=0



We calculate terms in parentheses: -(0.75(-1b+21)), so:

0.75(-1b+21)

We multiply parentheses

-0.75b+15.75

Back to the equation:

-(-0.75b+15.75)



We get rid of parentheses

b+0.75b-15.75=0

We add all the numbers together, and all the variables

1.75b-15.75=0

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

1.75b=15.75

b=15.75/1.75

b=9

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