-13
6 + 13 + 2 + 12 + 7 + 14 = 54
15 - 7 + 6 is 14
4 - 7 + 14 + 2 - 19 + 6 = 0
It is: 3/7+6/14 = 6/7
6 + 7 x 2= 6 + 14= 20
3 + 4 + 5 + 6 + 9 + 7 + 6 + 8 + 5 + 2 = 55
17
1 + 2 + 3 + 4 + 6 + 7 + 12 + 14 + 21 + 28 + 42 = 140
3/7 + 5/14 = 6/14 + 5/14 = 11/14
(12x6)+(14/7)72+274
3x2= 6 6-(4x-2)= 6--8= 6+8 = 14 14+7 = 21
72/7 + 65/7 = 14/1 or 14