Solve for C
C=\frac{12Pa}{7}
Solve for P
\left\{\begin{matrix}P=\frac{7C}{12a}\text{, }&a\neq 0\\P\in \mathrm{R}\text{, }&C=0\text{ and }a=0\end{matrix}\right.
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7C=12Pa
Swap sides so that all variable terms are on the left hand side.
\frac{7C}{7}=\frac{12Pa}{7}
Divide both sides by 7.
C=\frac{12Pa}{7}
Dividing by 7 undoes the multiplication by 7.
12aP=7C
The equation is in standard form.
\frac{12aP}{12a}=\frac{7C}{12a}
Divide both sides by 12a.
P=\frac{7C}{12a}
Dividing by 12a undoes the multiplication by 12a.
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