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