how do you calulate the sum or difference of 2/7-9/7+7/2

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You first need to find a common denominator, convert all fractions so that they have this common denominator and then solve. 2/7 = 4/14 9/7 = 18/14 7/2 = 49/14 4/14 - 18/14 + 49/14 = 35/14