Answer:
7 - (-3)
Explanation:
You want the sum 7 + 3 expressed as a difference.
Difference
The difference of A and B is written A - B. The subtraction operation is involved.
Subtraction is the same as addition of the opposite. Or, addition is the same as subtracting the opposite:
7 + 3 = 7 - (-3)
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Additional comment
We can also write the difference as ...
3 - (-7)
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