find the sum of : -2/5 + 7/13
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lcm
-2*13/5*13 = -26/65
7*5/13*5 = 35/65
-26/65 +35/65 =
-26+35 / 65 =9/65
7*5/13*5 = 35/65
-26/65 +35/65 =
-26+35 / 65 =9/65