The distance between directrix of the ellipse \( (4 x-8)^{2}+16 y^{2}= \) \( (x+\sqrt{3} y+10)^{...

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The distance between directrix of the ellipse \( (4 x-8)^{2}+16 y^{2}= \) \( (x+\sqrt{3} y+10)^{2} \) is
(a) 12
(b) 16
(c) 20
(d) 24
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