(х - 3/8) * 8/35 + 2 2/7 = 2 2/5
(х - 3/8) * 8/35 = 2 2/5 - 2 2/7
(х - 3/8) * 8/35 = 2 14/35 - 2 10/35
(х - 3/8) * 8/35 = 4/35
х - 3/8 = 4/35 : 8/35
х - 3/8 = 4/35 * 35/8
х - 3/8 = 1/1 * 1/2
х - 3/8 = 1/2
х = 1/2 + 3/8
х = 4/8 + 3/8
х = 7/8
7/8
Пошаговое объяснение:
(n - 3/8) * 8/35 + 2 2/7 = 2 2/5
8/35n - 3/35 = 4/35
8/35n = 7/35
n = 7/8
ответ: 7/8
