Solve for C_2
\left\{\begin{matrix}C_{2}=\frac{P_{4}}{60n}\text{, }&n\neq 0\\C_{2}\in \mathrm{R}\text{, }&P_{4}=0\text{ and }n=0\end{matrix}\right.
Solve for P_4
P_{4}=60C_{2}n
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60nC_{2}=P_{4}
Swap sides so that all variable terms are on the left hand side.
\frac{60nC_{2}}{60n}=\frac{P_{4}}{60n}
Divide both sides by 60n.
C_{2}=\frac{P_{4}}{60n}
Dividing by 60n undoes the multiplication by 60n.
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