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(x-a)^2 + (y-b)^2 = r^2
(x-2)^2 + (y+3)^2 = 7^2
x^2 - 4x +4 + y^2 + 3y + 9 = 49
x^2 + y^2 - 4x + 3y - 36 = 0
semoga membantu;)