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solve por Cramer: \begincases x + y + z = 2 }, {2x - y + z = 4 }, {x + 2y - z = 1 \endcases
solve por Cramer: \begincases x + y + z = 2 }, {2x - y + z = 4 }, {x + 2y - z = 1 \endcases
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