15+4/5-12=3+4/5
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the answer is 12
32/40 - 15/40 = 17/40
4/5 - 1/3 = 12/15 - 5/15 = 7/15
We convert it into thirty-fifths. That gives 15 thirty-fifths minus 14 thirty-fifths which is one thirty fifth.
the LCM is 15, so 7/3 is 35/15 and 4/5 is 12/15 35-12 is 23. 23/15 is the answer