# How do you combine like terms in (9m - 5) - ( 9m + 5)?

##### 1 Answer
Nov 2, 2016

This expression simplifies to $- 10$.

#### Explanation:

Begin by distributing the negative to the second binomial. Then you can combine like terms.

$\left(9 m - 5\right) - \left(9 m + 5\right)$
$9 m - 5 - 9 m - 5$
$- 10$

Remember that $9 m - 9 m = 0$.