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2/5 - -11/7 = 69/35
LCM(2, 5, 7, 11) = 770.
The median of 2 3 5 7 11 is 5, the central number.
7/11 minus 2/5 is 13/55
(5/11) - (2/7) = (35/77) - (22/77) = 13/77