A=-21+6a

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Solution for A=-21+6a equation: 



=-21+6A

We move all terms to the left:

-(-21+6A)=0

We add all the numbers together, and all the variables

-(6A-21)=0

We get rid of parentheses

-6A+21=0

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

-6A=-21

A=-21/-6

A=3+1/2

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