Answer:
-21, 12
Step-by-step explanation:
We first have to solve each of the list of numbers:
-45 -21 = -66
-21 - 16 = -37
-16+12=-4
33+40=73
-45-16=-61
-45+33 = -12
-45 + 12 = -33
-21 + 12 = -9
Hence, we can conclude that -21 and 12 add up to -9
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