verify : 3/5 + -2/7 = -2/7 + 3/5
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Answer: 3/5-2/7=-2/7+3/5
3*7/5*7 - 2*5/7*5 = -2*5/7*5 + 3*7/5*7
21/35 - 10/35 = -10/35 + 21/35
11/35 = 11/35
Therefore it is verified
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