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