Expressed as a decimal, 5 4/5 + (-3 2/7) = 2.5142857 recurring (that is, 2.5142857142857...)
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Negative 4 sevenths
(8/35) / (-2/7) = (8/35) * (-7/2) = -4/5
negative 2 sevenths(-2/7)
We convert it into thirty-fifths. That gives 15 thirty-fifths minus 14 thirty-fifths which is one thirty fifth.
The sum of -2/3 and -4/5 is -1 7/15