= (6 + 2/3) - (4 + 3/4)
= 6 + 2/3 - 4 - 3/4
= 6 - 4 + 2/3 - 3/4
= 2 + (8/12) - (9/12)
= 2 + (-1/12)
= 2 - 1/12
= 1 11/12

Ответ: 1 целых 11/12.