4 3/14-1 2/21 3 5/6+2 7/15-1 29/30
4.3/14-1.2/21=4.9/42-1.4/42=3.5/42 3.5/6+2.7/15-1.29/30=3.25/30+2.14/30-1.29/30=4.10/30=4.1/3