х + (2 1/6)х = 7 11/12
(3 1/6)х = 7 11/12
(19/6)х = 95/12
х = 95/12 : 19/6
х = 95/12 · 6/19
х = (5·1)/(2·1)
х = 5/2
х = 2 целых 1/2
Проверка:
5/2 + 13/6 · 5/2 = 7 11/12
5/2 + 65/12 = 7 11/12
30/12 + 65/12 = 7 11/12
95/12 = 7 11/12
х + (2 1/6)х = 7 11/12
(3 1/6)х = 7 11/12
(19/6)х = 95/12
х = 95/12 : 19/6
х = 95/12 · 6/19
х = (5·1)/(2·1)
х = 5/2
х = 2 целых 1/2
Проверка:
5/2 + 13/6 · 5/2 = 7 11/12
5/2 + 65/12 = 7 11/12
30/12 + 65/12 = 7 11/12
95/12 = 7 11/12