The length of the major axis of the ellipse \( \mathrm{P}^{13} \) \...

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The length of the major axis of the ellipse
\( \mathrm{P}^{13} \) \( (5 x-10)^{2}+(5 y+15)^{2}=\frac{(3 x-4 y+7)^{2}}{4} \) is:

W
(1) 10
(2) \( 20 / 3 \)
(3) \( 20 / 7 \)
(4) 4
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