(6, 0), (0, 6) and (7, 7) are the vertices of a triangle. The circle inscribed in the triangle has the equation ______.
A) x² + y² -9x + 9y + 36 = 0
B) x² + y² - 9x - 9y + 36 = 0
C) x² + y² + 9x - 9y + 36 = 0
D) x² + y² - 9x - 9y - 36 = 0

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