Find all solutions to the following systems of linear equation. (a) x1 + 4x2 - x3 +
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(a) x1 + 4x2 - x3 + x4 = 2
3x1 + 2x2 + x3 + 2x4 = 5
x1 - 6x2 + 3x3 =1
x1+ 14x2 - 5x3 + 2x4 = 3
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