-9 - (-5) = -4
You know like you do:
-10 - 9
is the same as
-10 + -9
that seems easier ^^ The same rules apply to -9 - -5. When you change the subtraction sign to a plus, you have to make the negative five a positive.
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-9 minus -5 is -4
-20
-71/5
its negative 4........
Negative twenty nine minus negative twenty one is negative eight.