Пошаговое объяснение:
(2 3/8-x): 3 1/4+2 13/15=3 1/6
(2 3/8-x) : 3 1/4 = 3 1/6 - 2 13/15
(2 3/8-x) : 3 1/4 = 3 5/30 - 2 26/30
(2 3/8-x) : 3 1/4 = 3/10
2 3/8 - x = 3/10 * 3 1/4
2 3/8 - x = 3/10 * 13/4
2 3/8 - x = 39/40
x = 2 3/8 - 39/40
x = 2 15/40 - 39/40
x = 1 16/40
x = 1 2/5
