Chapter 1 - Foundations for Algebra - 1-5 Adding and Subtracting Real Numbers - Practice and Problem-Solving Exercises - Page 34: 27

-3

Here, you are only going to look at the numerators. When looking at the numerators, you get 1+-7. This will get you to -6. Now you will put this back over the denominator to get $\frac{-6}{2}$, which is also equal to -3.