21=4b+5

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Solution for 21=4b+5 equation: 



21=4b+5

We move all terms to the left:

21-(4b+5)=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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