Система 3x3: \begincases x + y + z = 6 }, {2x - y + z = 3 }, {x + 2y - z = 2 \endcasesСистема 3x3: \begincases x + y + z = 6 }, {2x - y + z = 3 }, {x + 2y - z = 2 \endcases

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