-21=0.75a

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Solution for -21=0.75a 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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