Solve for A_0
A_{0}=\frac{A}{e^{r}}
Solve for A
A=A_{0}e^{r}
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A_{0}e^{r}=A
Swap sides so that all variable terms are on the left hand side.
e^{r}A_{0}=A
The equation is in standard form.
\frac{e^{r}A_{0}}{e^{r}}=\frac{A}{e^{r}}
Divide both sides by e^{r}.
A_{0}=\frac{A}{e^{r}}
Dividing by e^{r} undoes the multiplication by e^{r}.
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