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49
31
31.
9 subtracted from 40 = -31
48
it is a prime number
81 - 50 = 31 50 - 19 = 31
It is 31.
-31 (5*(-7))-(-4) (-35)+4 -31
15.5 x 2 = 31
6
16 31-15=16 15-31=-16