Solve \begincases x + 2y - z = 4 }, {2x + y + z = 6 }, {x - y + 2z = 3 \endcases by row reductionSolve \begincases x + 2y - z = 4 }, {2x + y + z = 6 }, {x - y + 2z = 3 \endcases by row reduction

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