5. Write a related subtraction fact for $7+6=13$.

Step 1 ：The question is asking for a subtraction fact related to the given addition fact. In other words, we need to find a subtraction equation that uses the same numbers as the given addition equation.

Step 2 ：The addition fact is \(7+6=13\). A related subtraction fact would be to subtract one of the addends from the sum.

Step 3 ：sum = 13, addend1 = 7, addend2 = 6

Step 4 ：Subtract addend1 from the sum: \(13 - 7 = 6\)

Step 5 ：Subtract addend2 from the sum: \(13 - 6 = 7\)

Step 6 ：Final Answer: The related subtraction facts for \(7+6=13\) are \(13-7=\boxed{6}\) and \(13-6=\boxed{7}\)