9/10 + 6/10 = 15/10 (Which can be written as 3/2 or 11/2)
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6/9 + 4/9 = 10/9 = 1 and 1/9
9 over 10 + 5 over 6 = 27 over 30 + 25 over 30 = 52 / 30 = 26/15 = 1 11/15
9 + 6 - 2 + 7 - 10 = -4
The LCM of 10 and 13 is 130 9/10 (13) + 6/13 (10) 117/130 + 60/130 = 177/130 = 1 and 47/130
13/9 or 11/3