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