Solve for N_0
N_{0}=\frac{N_{t}}{e^{rt}}
Solve for N_t
N_{t}=N_{0}e^{rt}
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N_{0}e^{rt}=N_{t}
Swap sides so that all variable terms are on the left hand side.
e^{rt}N_{0}=N_{t}
The equation is in standard form.
\frac{e^{rt}N_{0}}{e^{rt}}=\frac{N_{t}}{e^{rt}}
Divide both sides by e^{rt}.
N_{0}=\frac{N_{t}}{e^{rt}}
Dividing by e^{rt} undoes the multiplication by e^{rt}.
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