4 - (41\84 -5\21) +7 11\30

4 - (41\84 -5\21) +7 11\30=11 7/60
1)41/84-5/21=41/84-20/84=21/84=1/4
2)4-1/4=3 3/4
3)3 3/4+7 11/30=3 45/60+7 22/60=10 67/60=11 7/60