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