84=21b^-2

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Solution for 84=21b^-2 equation: 



84=21b^-2

We move all terms to the left:

84-(21b^-2)=0

We get rid of parentheses

-21b^+2+84=0

We add all the numbers together, and all the variables

-21b+86=0

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

-21b=-86

b=-86/-21

b=4+2/21

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