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II. Transform the general equation of a circle into standard form.
6. x2 + y2 - 14% -15 = 0
7. x² + y2 + 4y -45 = 0
8. x² + y2 + 4x - 96 = 0
9. x² + y2 - 10x - 10y + 23 = 0
10. x² + y2 + 8x +8y = 0​