\( \definecolor{colordef}{RGB}{249,49,84} \definecolor{colorprop}{RGB}{18,102,241} \)
Write the equivalent system after applying the row operation \(R_2 \leftarrow R_2 - 2R_1\). $$ \left\{ \begin{array}{rcrcrc} x &-& 3y &=& 1 & \quad (R_1) \\ 2x&+& y &=& -1 & \quad (R_2) \end{array}\right. $$
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