21=5-4b

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Solution for 21=5-4b equation: 



21=5-4b

We move all terms to the left:

21-(5-4b)=0

We add all the numbers together, and all the variables

-(-4b+5)+21=0

We get rid of parentheses

4b-5+21=0

We add all the numbers together, and all the variables

4b+16=0

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

4b=-16

b=-16/4

b=-4

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