first i would write the problem as:
(4/13)-(7/20)
then you could type that in a calculator or do it the long way.
Which ever way you chose the answer would be -11/260
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7 over 20 is greater than 4 over 15
The LCM of 20 and 12 is 60.39/60 - 35/60 = 4/60 or 1/15
(4/6) / (7/13) = 2/3 * (13/7) = 26/21 or 15/21
20
It is: 4/7 minus 5/12 = 13/84