Вычислите: (-7 1/3+6 7/8): 3/4+(-5 1/4+4 21/40): 1 9/20 решите по действиям

(-7 1/3+6 7/8):3/4+(-5 1/4+4 21/40):1 9/20 = - 1 1/9

1)  -7 1/3+6 7/8 = - 7 8/24 + 6 21/24 = - 6 32/24 + 6 21/24 = - 11/24
2) - 11/24 : 3/4 = -11/24 * 4/3 = - 11/18
3) -5 1/4+4 21/40 = - 5  10/40 + 4 21/40 = -4 50/40 + 4 21/40 = -29/40
4) - 29/40 : 1 9/20 = -29/40 : 29/20 = -29/40 * 20/29 = -1/2 
5) - 11/18 + (-1/2) = - 11/18 - 9/18 = -20/18 = -10/9 = -1 1/9

ответ - 1 1/9