EF=0 means when the net force on something is 0 (zero).
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The existence of the additive inverse (of ab).
If you mean 5 times 0 then it equals to 0
It just means that the value of 0 is equal to the value of 0, which is correct. It's like saying 2 equals 2, or 6 equals 6, or 52657 equals 52657... you get the point.
the sum of all answers is equal to 0
It means 3 multiplied by 0, the answer to this is 0 because anything multiplied by 0 equals 0.