Solve for c
\left\{\begin{matrix}c=\frac{r}{18m}\text{, }&m\neq 0\\c\in \mathrm{R}\text{, }&r=0\text{ and }m=0\end{matrix}\right.
Solve for m
\left\{\begin{matrix}m=\frac{r}{18c}\text{, }&c\neq 0\\m\in \mathrm{R}\text{, }&r=0\text{ and }c=0\end{matrix}\right.
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18cm=r
Swap sides so that all variable terms are on the left hand side.
18mc=r
The equation is in standard form.
\frac{18mc}{18m}=\frac{r}{18m}
Divide both sides by 18m.
c=\frac{r}{18m}
Dividing by 18m undoes the multiplication by 18m.
18cm=r
Swap sides so that all variable terms are on the left hand side.
\frac{18cm}{18c}=\frac{r}{18c}
Divide both sides by 18c.
m=\frac{r}{18c}
Dividing by 18c undoes the multiplication by 18c.
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