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If 2kx + 3y - 1 = 0 , 2x + y + 5 = 0 a...

If 2kx + 3y - 1 = 0 , 2x + y + 5 = 0 are conjugate lines with respect to the circle `x^(2) +y^(2) - 2x - 4y - 4 = 0 ` , t hen k =

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