x = \sum z
Solve for z
\left\{\begin{matrix}z=\frac{x}{Σ}\text{, }&Σ\neq 0\\z\in \mathrm{R}\text{, }&x=0\text{ and }Σ=0\end{matrix}\right.
Solve for x
x=zΣ
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Σz=x
Swap sides so that all variable terms are on the left hand side.
\frac{Σz}{Σ}=\frac{x}{Σ}
Divide both sides by Σ.
z=\frac{x}{Σ}
Dividing by Σ undoes the multiplication by Σ.
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