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solve completamente: \begincases x + 2z = 1 }, {2y + 4z = 4 }, {x + 2y + 6z = 5 \endcases
solve completamente: \begincases x + 2z = 1 }, {2y + 4z = 4 }, {x + 2y + 6z = 5 \endcases
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