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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.
The problem 20 minus negative 24 equals 44 because two negatives become a positive.
positive plus positive equals positive negative plus negative equals negative
-20 -(-5) = -15 ie -(-5) = +5 therefore -20 +5 =15 (two double minuses = a positive)
It equals 32. The two subtractions cancel each other out, leaving you with 16 + 16.