-4 + 4 = 0. If you rearrange the problem so that it says 4-4 then you will understand that the answer is zero.
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Treat the "plus positive X" as "minus negative X". Example: Positive two plus positive two equals positive four. Positive two minus negative two equals positive four.
posative four or + 4
positive plus positive equals positive negative plus negative equals negative
negative plus positive equals to zero
Because "minus a negative" is tha same as "plus a positive". So, a positive minus a negative is a positive plus a positive which is a positive.