21=0.75*a

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Solution for 21=0.75*a equation: 



21=0.75a

We move all terms to the left:

21-(0.75a)=0

We add all the numbers together, and all the variables

-(+0.75a)+21=0

We get rid of parentheses

-0.75a+21=0

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

-0.75a=-21

a=-21/-0.75

a=+28

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