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State the center and radius of the circle with the given equations. (x+3)^2+(y-7)^2=81

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Find the center and radius of the circle with the given equation. x^2+y^2+4 x+6 y+16=0

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Find the center and radius of the circle with the given equation. 2 x^2+2 y^2-12 x+4 y-15=0