Solve \begincases 2x - y = 0 }, {x + 3y = 7 \endcases by row reduction. (Ans: x = 1, y = 2 .)Solve \begincases 2x - y = 0 }, {x + 3y = 7 \endcases by row reduction. (Ans: x = 1, y = 2 .)

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