adding negatives
-1+-1
-2
-2x3
-6
0%
impossible
-2 -2
-4
-2-2
4
-5+4
-1
-4x-7
28
25%
unlikly
-7-9
-16
-4-4
16
-25+-49
-74
-9x-11
99
50%
even
-15-19
-34
-7-4
28
-74+-105
-179
-15x-14
210
75%
likley
-29-34
-63
-9-6
54
-722+-638
-1360
-27x-21
567
100%
certain
-46-94
-140
-11-6
66