If that's -7/10 - 2/5, that equals -11/10
If that's -7 + 10 - 2 + 5, that equals 6
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In simplest form, 5/5 is 1.
7.8 = 78/10 which, in its simplest form, is 39/5
2 and 5/6 is in its simplest form.
2/10 = 1/5
9/10 + 3/4 18/20 + 15/20 = 33/20 or 1 and 13/20