7 8/19 +2 3/19 - 8 11/19+3 5/19 =4 4/19
7 8/19+2 3/19=9 10/19
9 10/19-8 11/19=18/19
18/19+3 5/19=4 4/19
7 8/19 +2 3/19 - 8 11/19+3 5/19 =4 4/19
7 8/19+2 3/19=9 10/19
9 10/19-8 11/19=18/19
18/19+3 5/19=4 4/19