It is a non-mathematical statement alerting the other person that things may not be as straightforward as they might appear and that there may be other factors which need to be taken into consideration. When you do take these into account, the sum is no longer simply "two plus two" and so the answer will not be four.
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Yes, it equals four.
4+2=6 Four plus two equals six.
Nine plus four equals thirteen and that's ONE baker's dozen.
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