-9
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-12 does.
-- When added to 9, it becomes -3 .
-- When multiplied by 1/2 , it becomes -6 .
3 is a Prime number, which means it can only be multiplied by itself or by 1. 1x3 =3, or 3x1 is 3. The number 3 adds to be 6 twice; 2 x 3 = 6.
-21
-21
-3 and -3
9