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It does not unless the question is a riddle and has nothing to do with basic arithmetic or if "plus" or "equals" are defined in a non-conventional way.
-10 + 8 = -2
Tautology?
10?
273 13+8 = 21 and 13*21 = 273
8 + 2 = 10
2 plus 8 equals 10.
46
(1, 9)
134
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144
8.