Find common denominators. What you do to the denominator, you do to the numerator.
(2/5)(7/7) = 14/35
(3/7)(5/5) = 15/35
14/35 - 15/35 = -1/35
If you meant to put addition, then your answer will be D) 29/35.
14/35 + 15/35 = 29/35
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