Решить пример: (1/2+2/3)*6/7-2/3: 3=? пример решается с дробями

(1/2+2/3)*6/7-2/3:3= (3/6 + 4/6) * 6/7 - 2/3 * 1/3 = 7/6 * 6/7 - 2/9 = 1 - 2/9 = 9/9 - 2/9 = 7/9

1) 1/2 + 2/3 = 3/6 + 4/6 = 7/6
2) 7/6 * 6/7 = 1
3) 2/3 : 3 = 2/3 * 1/3 = 2/9
4) 1 - 2/9 = 9/9 - 2/9 = 7/9