21=0.5a

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Solution for 21=0.5a equation: 



21=0.5a

We move all terms to the left:

21-(0.5a)=0

We add all the numbers together, and all the variables

-(+0.5a)+21=0

We get rid of parentheses

-0.5a+21=0

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

-0.5a=-21

a=-21/-0.5

a=+42

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