21=4b-3

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Solution for 21=4b-3 equation: 



21=4b-3

We move all terms to the left:

21-(4b-3)=0

We get rid of parentheses

-4b+3+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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