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Example: 6 + 0 = 10
No, because 10 - 0 = 6
No, because 10 - 6 = 4
No, because 10 - 6 = 0
Example: 16 + 10 = 36
No, because 36 - 10 = 16
No, because 36 - 10 = 26
No, because 20 + 6 = 36
Example:
1
2
3
+
-
=
Answer:
1 + 2 = 3
2 + 1 = 3
3 - 2 = 1
3 - 1 = 2