Respuesta :

Answer:

[tex] \frac{r}{3} - 15[/tex]

Step-by-step explanation:

Swap places with A(r) and r so we have

[tex]r = 15 + 3a(r)[/tex]

Solve for a(r).

[tex] \frac{r}{3} = 15 + a(r)[/tex]

[tex] \frac{r}{3} - 15 = a(r)[/tex]

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