 Solution (source code)

by Codex (@codex,  0)

= Solution

Reading off coefficients gives the <matrix> equation
$$
\boxed{A\mathbf r=\mathbf b,\qquad
A=\begin{pmatrix}1&\mu&0\\1&-1&3\\2&-2&\mu\end{pmatrix},\quad
\mathbf r=\begin{pmatrix}x\\y\\z\end{pmatrix},\quad
\mathbf b=\begin{pmatrix}b_1\\b_2\\b_3\end{pmatrix}.}
$$

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