21=45-4b

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Solution for 21=45-4b equation: 



21=45-4b

We move all terms to the left:

21-(45-4b)=0

We add all the numbers together, and all the variables

-(-4b+45)+21=0

We get rid of parentheses

4b-45+21=0

We add all the numbers together, and all the variables

4b-24=0

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

4b=24

b=24/4

b=6

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