Sweetie, when you subtract a negative, it's like adding a positive. So, 16 minus negative 4 is the same as 16 plus 4, which equals 20. Math doesn't have to be a drama, darling.
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16 minus -4 is 20.
Seven minus negative two times negative 4 is equal to -1
4
-4 - 4 = -8
Negative 4 minus positive 2 is equal to negative 6.