Due to how the question is written, I'm not sure exactly what you're asking.
If it is 1 - 7/13 = n/d, then it is 6/13, and n = 6 and d = 13.
If it (1-7)/13, then it is -6/13, and n = -6 and d = 13.
You'll want to check how the original problem is written.
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