9.13 Solve: X1 + x2 - x3 = -3 6x1 + 2x2 + 2x3 = 2 -3x1 + 4x2 + X3 = 1 with (a) naive Gauss elimination, (b) Gauss elimination with par- tial pivoting, and (c) Gauss-Jordan without partial pivoting.

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