(7 1/9 - 2 14/15) / (2 2/3 + 1 3/5) - (3/4 - 1/20) * (5/7 - 5/14) =
(64/15 - 44/15) / (8/3 + 8/5) - (15 - 1)/20 * (10-5)/14 =
(320 - 132)/45 / (40+24)/15 - 14/20 * 5/14 =
188/45 * 15/64 - 1/4 =
47/3 * 1/16 - 1/4 =
47/48 - 1/4 =
( 47 - 12 )/48 =
35/48