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?
46
273 13+8 = 21 and 13*21 = 273
8 + 2 = 10
(1, 9)
134
144
26
10 x 3 + 8 x 3 30 + 24 54 10 times 3 plus 8 times 3 equals 54.
13