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