The LCM of 13 and 19 is probably 247. 6 x 19 equals 114 while 2 x 13 equals 26. 114 - 26 equals 88.
The answer to it is 88 over 247.
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It is: 2/7 minus 5/8 is = -19/56
7/11 minus 2/5 is 13/55
13 + 12 - 6 - 2 (16 plus 12 minus 6 minus 2) (13 + 12 = 25. 25 - 6 = 19. 19 - 2 = 17!
13/30
2\5-7\8= -19\40