11 - (3-3/5) = (55/5) - (18/5) = 37/5 = 7-2/5 = 7.4
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two fifths
six and three fifths
Call it 21 fifths minus 13 fifths, ie 8 fifths which is one-and-three-fifths
6 and two fifths
Three fifths minus fifteen equals -14 and two fifths.