2- Solve the following system of equations using the Gauss and Gauss-Jordan elimination methods. 2x1 + x2 - x3 +4x4 = 19 -x1 - 2x2 + x3 + 2x4 = -3 2x1 + 4x2 + 2x3 + x4 = 25 X1 - 2x2 + 4x3 = 16

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