Solve for g
\left\{\begin{matrix}g=\frac{2s}{t}\text{, }&t\neq 0\\g\in \mathrm{R}\text{, }&s=0\text{ and }t=0\end{matrix}\right.
Solve for s
s=\frac{gt}{2}
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\frac{1}{2}gt=s
Swap sides so that all variable terms are on the left hand side.
\frac{t}{2}g=s
The equation is in standard form.
\frac{2\times \frac{t}{2}g}{t}=\frac{2s}{t}
Divide both sides by \frac{1}{2}t.
g=\frac{2s}{t}
Dividing by \frac{1}{2}t undoes the multiplication by \frac{1}{2}t.
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