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By the identity property, the only numbers that can equal -6 and 40 are -6 and 40 themselves.
52
6+6+6+6=20
-222
-34
-1
6 and -5
-66
13
8
From the numbers 6, 12, 15, 18. 23. 24. 30, 33, 40
The numbers are: 3-sq rt of 3 and 3+sq rt of 3