Multiply: negative 1 times 7.

1. Multiplying any number by negative 1 gives that number's opposite. 2. The opposite of 7 is negative 7. 3. Since the signs of negative 1 and 7 are different, the negative result also matches the different-signs rule. _Source: OpenStax Prealgebra (CC BY 4.0), Ch 3 "Integers", section 3.4 Multiply and Divide Integers_