The expression 15 - 7 can be expressed as the sum 15 + (-7)
Note that a subtraction expression (a - b) can be rewritten as:
a + (-b)
That is:
a - b = a + (-b)
Therefore, the expression 15 - 7 can be re-expressed as:
15 - 7 = 15 + (-7)
To confirm:
15 - 7 = 8
15 + (-7) = 15 - 7 = 8
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