7
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n + 20 - 17 + 13 - n = 20 - 17 + 13 = 3 + 13 = 16
13/20 - 3/5 = 13/20 - 12/20 = 1/20
20 multiplied by 13 is 260.
21
If the fractions have the same denominator, just add or subtract the numerators. 13/20 - 9/20 = 4/20 2/5 + 1/5 = 3/5