(1 point) The vectors \[ \vec{v}_{1}=\left[\begin{array}{c} 1 \\ -1 \\ 0 \end{array}\right], \quad \vec{v}_{2}=\left[\begin{array}{c} -7 \\ 2 \\ -2 \end{array}\right], \quad \vec{v}_{3}=\left[\begin{array}{c} -18 \\ 3 \\ k \end{array}\right] \] form a basis for \( R^{3} \) if and only if \( k \neq \)