Question: Find all solutions to the linear system x1 - x2 + 3x3 + 2x4 = 1 -x1 + x2 - 2x3 + x4 = -2

Find all solutions to the linear system
x1 - x2 + 3x3 + 2x4 = 1
-x1 + x2 - 2x3 + x4 = -2
2x1 - 2x2 + 7x3 + 7x4 = 1

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