7/8 - 2/6 = 7/8 - 1/3 = 21/24 - 8/24 = 13/24
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7/8 minus 2/3 is 5/24
2 minus -9 is 11.
You have to get the same common denominator, 9x2 is 18, so 7x2 is 14. 14/18-5/18 is 9/18. 9/9 is 1 and 18/9 is 2, so you are left with 1/2
20 minus 17 minus 3 minus 2 equals -2
9 minus 7 = 2