Answer:
10
Explanation:
The difference of 12 and 9 is 3.
Now,
If we add 7 to 3, the answer is 10.
7+3 = 10
if I understand the problem strangeness right, and there is nothing missing in it, then this is the simple answer.
the difference of 12 and 9 is 12-9 = 3.
and then adding this 3 to 7 is 7+3 =10
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