21=b/3+15

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Solution for 21=b/3+15 equation: 



21=b/3+15

We move all terms to the left:

21-(b/3+15)=0

We get rid of parentheses

-b/3-15+21=0

We multiply all the terms by the denominator


-b-15*3+21*3=0

We add all the numbers together, and all the variables

-1b+18=0

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

-b=-18

b=-18/-1

b=+18

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