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-5-4 =-9 The difference is 9 (negative)
It means subtraction. Example: What is the difference of 9 and 5? 9-5=4 The difference (or answer) is 4!
4 + 5 = 9 4 and 5 are two numbers with the sum of 9 and have a difference of 5
9 and 4 9-4 = 5 9*4 = 36
5 + 4 = 9 5 - 4 = 1