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{ 3x1 - x2 + 2x3 = 17; x1 + 5x2 - x3 = 8; 2x1 + x2 = 8 }
{ 3x1 - x2 + 2x3 = 17; x1 + 5x2 - x3 = 8; 2x1 + x2 = 8 }
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