21=5b-4

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Solution for 21=5b-4 equation: 



21=5b-4

We move all terms to the left:

21-(5b-4)=0

We get rid of parentheses

-5b+4+21=0

We add all the numbers together, and all the variables

-5b+25=0

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

-5b=-25

b=-25/-5

b=+5

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