\( 9x^2 + y^2 + 20 = 12x + 8y \) 6) \( x^2 + 2x + y^2 - 6y + 4z^2 - 4z + 11 = 0 \) 7) \( (x - z)^2 + y^2 + z^2 = 2xy - 2yz + 6z - 9 \)
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5) \( 9x^2 + y^2 + 20 = 12x + 8y \)
6) \( x^2 + 2x + y^2 - 6y + 4z^2 - 4z + 11 = 0 \)
7) \( (x - z)^2 + y^2 + z^2 = 2xy - 2yz + 6z - 9 \)