Уравнение
4 целых 1/8-2 целых 7/12x=2 целых 5/6

4 1/8 - 2 7/12х = 2 5/6
2 7/12х = 4 1/8 - 2 5/6 = 33/8 - 17/6 = (99-68)/24 = 31/24
х = 31/24 : 2 7/12 = 31/24 : 31/12 = 31/24 * 12/31 = 1/2