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Determine the type of the second-ordersurface and find the coordinates of its center(if it exists): 3x + y + 4z - 2xy - 6xz+4yz +

Determine the type of the second-ordersurface and find the coordinates of its center(if it exists): 3x² + y² + 4z² - 2xy - 6xz+4yz + 4x - 2y - 6z= -=-1

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