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Find all solutions to the following systems.
x1 − x2 + x3 − 2x4 = 1
−x1 + x2 + x3 + x4 = −1
−x1 + 2x2 + 3x3 − x4 = 2
x1 − x2 + 2x3 + x4 =

Sagot :

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