b=0.05(21000-b)

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Solution for b=0.05(21000-b) equation: 



b=0.05(21000-b)

We move all terms to the left:

b-(0.05(21000-b))=0

We add all the numbers together, and all the variables

b-(0.05(-1b+21000))=0



We calculate terms in parentheses: -(0.05(-1b+21000)), so:

0.05(-1b+21000)

We multiply parentheses

-0.05b+1050

Back to the equation:

-(-0.05b+1050)



We get rid of parentheses

b+0.05b-1050=0

We add all the numbers together, and all the variables

1.05b-1050=0

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

1.05b=1050

b=1050/1.05

b=1000

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