This is an equation
$$
\begin{aligned}
& a^3-\frac{1}{a^3}-3 \cdot a \cdot \frac{1}{a}\left(a-\frac{1}{a}\right)=7^3=343 \
\end{aligned}
$$
This is an equation
$$
\begin{aligned}
& a^3-\frac{1}{a^3}-3 \cdot a \cdot \frac{1}{a}\left(a-\frac{1}{a}\right)=7^3=343 \
\end{aligned}
$$
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