A15=A+(n-1)9

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Solution for A15=A+(n-1)9 equation: 



15=+(A-1)9

We move all terms to the left:

15-(+(A-1)9)=0



We calculate terms in parentheses: -(+(A-1)9), so:

+(A-1)9

determiningTheFunctionDomain
(A-1)9

We multiply parentheses

9A-9

Back to the equation:

-(9A-9)



We get rid of parentheses

-9A+9+15=0

We add all the numbers together, and all the variables

-9A+24=0

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

-9A=-24

A=-24/-9

A=2+2/3

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