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Mathematics 15 Online
OpenStudy (anonymous):

whats 2/5+7/10-2/7

OpenStudy (gw2011):

Find a common denominator: 2/5=28/70 7/10=49/70 -2/7=-20/70 Add the numerators and you get:28+49-20=57 Therefore, the answer is: 57/70

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