$$Z=ab$$
$\left\{\begin{matrix}a=\frac{Z}{b}\text{, }&b\neq 0\\a\in \mathrm{R}\text{, }&Z=0\text{ and }b=0\end{matrix}\right.$
$$ab=Z$$
$$ba=Z$$
$$\frac{ba}{b}=\frac{Z}{b}$$
$$a=\frac{Z}{b}$$
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$Z=ab$
