b=21A/15

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Solution for b=21A/15 equation: 



b=21/15

We move all terms to the left:

b-(21/15)=0

We add all the numbers together, and all the variables

b-(+21/15)=0

We get rid of parentheses

b-21/15=0

We multiply all the terms by the denominator


b*15-21=0

Wy multiply elements

15b-21=0

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

15b=21

b=21/15

b=1+2/5

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