77/12 - 411/15 = 735/60 - 444/60 = 695/60 - 444/60 = 251/60
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7
7/9 > 11/15
7/10 minus 9/15 is 1/10
Eleven of anything minus seven of the same thing leaves four of them.
Well, 11 + 7 = 18. 18/15 = 1 and 3/15 = 1 and 1/5.