It can't be done. Seven fourteenths is bigger than three sevenths.
Actually, 3/7 = 6/14
6/14 - 7/14 = ( -1/14) (negative 1/14)
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7 sevenths
6/14 - 2/14 = 4/14 = 2/7 or 3/7 - 1/7 = 2/7
No - 2/14 is equal to 1/7 or one seventh. Three sevenths is equal to 6/14 or six fourteenths.
2/7 = 4/14 9/14 - 4/14 = 5/14
negative 2 sevenths(-2/7)