(7 5\7:3 3\5-1\7)*1 5\28=

(7 5\7:3 3\5-1\7)*1 5\28=2 41/392
1) 7 5/7:3 3/5=54/7:20/5=54/7*5/20=27/7*1/2=27/14=1 13/14
2) 1 13/14-1/7=1 13/14-2/14=1 11/14
3) 1 11/14*1 5/28=25/14*33/28=825/392=2 41/392