Do Gauss-Jordan reduction (a) x + y - z = 3 2x - y - z =
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(a) x + y - z = 3
2x - y - z = 1
3x + y + 2z = 0
(b) x + y + 2z = 0
2x - y + z = 1
4x + y + 5z = 1
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