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Let \(d_1\) and \(d_2\) be two lines with direction vectors \(\Vect{u}=\begin{pmatrix} x \\ 1 \end{pmatrix}\) and \(\Vect{v}=\begin{pmatrix} 1 \\ x \end{pmatrix}\) respectively. Find the values of the real number \(x\) such that the two lines are parallel.
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