Answer:
2x² + 12x + 2y² - 16y - 150 = 0
x² + 6x + y² - 8y - 75 = 0
x² + 6x + y² - 8y = 75
x² + 6x + 9 + y² - 8y + 16 = 100
(x + 3)² + (y - 4)² = 10²
Center: (-3, 4)
Radius: 10
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