1/5 + 0.2 * 5/7 = 1/5 + 1/3 = (3 + 5) / 15 = 8/15
(1 2/5 - 1/3) 5/8 = (7/5 - 1/3) 5/8 = ((21 - 5) / 15) 5/8 = 16/15 5/8 = 80/120 = 2/3
1/5 + 0.2 * 5/7 = 1/5 + 1/3 = (3 + 5) / 15 = 8/15
(1 2/5 - 1/3) 5/8 = (7/5 - 1/3) 5/8 = ((21 - 5) / 15) 5/8 = 16/15 5/8 = 80/120 = 2/3