(30:27-1/3)*2 1/7+2/5-5 =-2 14/15
1) 30:27=10/9 = 1 1/9
2) 1 1/9-1/3=10/9-1/3=10/9-3/9=7/9
3) 7/9*2 1/7=7/9*15/7=15/9=5/3=1 2/3
4) 1 2/3+2/5=5/3+2/5=25/15+6/15=31/15=2 1/15
5) 2 1/15-5=31/15-75/15=-44/15=-2 14/15
6/9*1/7 = 2/3*1/7 = 2/21
1 49/9+2/5 = 58/9+2/5=290/45+18/45=308/45=6 38/45