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{x+7y+3v+5u=168x+4y+6v+2u=−162x+6y+4v+8u=165x+3y+7v+u=−16\begin{cases} x + 7y + 3v + 5u = 16 \\ 8x + 4y + 6v + 2u = -16 \\ 2x + 6y + 4v + 8u = 16 \\ 5x + 3y + 7v + u = -16 \end{cases} ⎩⎪⎪⎪⎨⎪⎪⎪⎧x+7y+3v+5u=168x+4y+6v+2u=−162x+6y+4v+8u=165x+3y+7v+u=−16
Real numbers xxx, yyy, uuu, and vvv satisfy the system of equations above. Find xyuvxyuvxyuv.
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