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OpenStudy (anonymous):
6(4/5)n-(8/9)=(7/15)n
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Directrix (directrix):
6(4/5) n - (8/9 )= (7/15) n Multiply both sides by 45 ...
Directrix (directrix):
45[6(4/5) n] - 45(8/9 )=45 (7/15) n 216 n - 40 = 21 n ----> Please check
Directrix (directrix):
216 n - 21 n = 40
Directrix (directrix):
195 n = 40 n = 40/ 195 = 8 / 39
Directrix (directrix):
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