A=7z-13z-21

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Solution for A=7z-13z-21 equation: 



=7A-13A-21

We move all terms to the left:

-(7A-13A-21)=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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