Resuelve \begincases x + 2y = 7 }, {3x - y = 1 \endcases . (Resp.: ((9)/(7), (20)/(7)) .)Resuelve \begincases x + 2y = 7 }, {3x - y = 1 \endcases . (Resp.: ((9)/(7), (20)/(7)) .)

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