21 2/59-2/5*(3 15/28÷9/28-1: 1 10/49): 2 по действиям

1) 3 15/28 : 9/28 = 99/28 : 9/28 = 11 
2) 1 : 1 10/49 = 1 : 59/49 = 49/59 
3) 11 - 49/59 = 10 10/59 
4) 2/5 * 10 10/59 = 2/5 * 600/59 = 240/59 = 4/59
5) 4/59 : 2 = 2/59 
6) 21 2/59 - 2/59 = 21 
ответ 21