A=15+3n

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Solution for A=15+3n equation: 



=15+3A

We move all terms to the left:

-(15+3A)=0

We add all the numbers together, and all the variables

-(3A+15)=0

We get rid of parentheses

-3A-15=0

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

-3A=15

A=15/-3

A=-5

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