21=15+5b

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Solution for 21=15+5b equation: 



21=15+5b

We move all terms to the left:

21-(15+5b)=0

We add all the numbers together, and all the variables

-(5b+15)+21=0

We get rid of parentheses

-5b-15+21=0

We add all the numbers together, and all the variables

-5b+6=0

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

-5b=-6

b=-6/-5

b=1+1/5

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