\sum a _ { n } = b
Solve for a_n
\left\{\begin{matrix}a_{n}=\frac{b}{Σ}\text{, }&Σ\neq 0\\a_{n}\in \mathrm{R}\text{, }&b=0\text{ and }Σ=0\end{matrix}\right.
Solve for b
b=a_{n}Σ
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Σa_{n}=b
The equation is in standard form.
\frac{Σa_{n}}{Σ}=\frac{b}{Σ}
Divide both sides by Σ.
a_{n}=\frac{b}{Σ}
Dividing by Σ undoes the multiplication by Σ.
b=Σa_{n}
Swap sides so that all variable terms are on the left hand side.
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