Solve for t
\left\{\begin{matrix}t=\frac{d}{v}\text{, }&v\neq 0\\t\in \mathrm{R}\text{, }&d=0\text{ and }v=0\end{matrix}\right.
Solve for d
d=tv
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vt=d
Swap sides so that all variable terms are on the left hand side.
\frac{vt}{v}=\frac{d}{v}
Divide both sides by v.
t=\frac{d}{v}
Dividing by v undoes the multiplication by v.
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