We need to convert, and we can do so into fourteenths. One half is 7 fourteenths. One seventh is 2 fourteenths. 7 - 2 = 5, so the answer is 5 fourteenths, which cannot be simplified any further.
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3/28
One half minus one fifth is 3 tenths
1/3 minus 1/7 is 4/21.
Four minus one and a half is two and a half: 4 - 1.5 = 2.5
1/2 or one half