its negative 4........
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-20
-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.
negative five
-5/9, -10/18, -15/27
negative numbers are numbers less than zero. negative numbers have a negative sign in front of them EX: -9 negative nine positive numbers are anything more than zero. EX: 9 positive nine