a=21+3z

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Solution for a=21+3z equation: 



=21+3A

We move all terms to the left:

-(21+3A)=0

We add all the numbers together, and all the variables

-(3A+21)=0

We get rid of parentheses

-3A-21=0

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

-3A=21

A=21/-3

A=-7

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