−x+2y−4z−5u=27, −2x−3y+3z−3u=9, 5x−4y+2z−3u=5, −2x+4z−5u=29−x+2y−4z−5u=27, −2x−3y+3z−3u=9, 5x−4y+2z−3u=5, −2x+4z−5u=29

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