39 minus -20/6 is 42 1/3
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Negative twenty nine minus negative twenty one is negative eight.
A positive minus a negative is a positive.
We can convert into seventy-fifths. 6 and nine seventy-fifths minus twenty-five seventy-fifths equals negative 6 and thirty-four seventy-fifths.
Because "minus a negative" is tha same as "plus a positive". So, a positive minus a negative is a positive plus a positive which is a positive.