11/21
To subtract two fractions, you need to make the denominators (the bottom numbers) equal.
6/7 = 18/21
1/3 = 7/21
18/21 - 7/21 = 11/21
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10 and 6 sevenths
6/7 minus 1/5 is 23/35.
a - 5 is 6. So a is 11
4 1/7 minus 2 6/7 = 1 2/7
Expressed as a proper fraction in its simplest form, 6/7 - 1/3 = 11/21 or eleven twenty-firsts. Expressed as a decimal, this is equal to 0.523809 recurring (that is, 0.523809523809...)