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in parts a and b use gaussian elimination to solve the systems of linear equations. show...

in parts a and b use gaussian elimination to solve the systems of linear equations. show all steps.

a. x1 - 4x2 - x3 + x4 = 3

3x1 - 12 x2 - 3x4 = 12

2x1 - 8x2 + 4x3 - 10x4 = 12

b. x1 + x2 + x3 - x4 = 2

2x1 + 2x2 - 2x3 = 3

2x1 + 2x2 - x4 = 2

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