You need to put -3 as a fraction so you make it -3/1 -8/5
Then you need to make them the same denominator. So -15/5 - 8/5 =-23/5
Then to make it a mixed number it would be 4 3/5.
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8 minus negative three or 8--3 equal positive 11. The double negative converts the minus sign into a plus sign and the negative into a positive.
-3 minus -11 is 8.
11 and 2/5 minus 2 and 3/5 = 8 and 4/5 or 8.8
3/8 minus 1/5 is 7/40
6/10 = 3/5