Distributive property (multiply what is in the parenthesis by what is out of it)
-2m -6 * m + -6 * 1
-2m -6m - 6
Combine like terms
-2m + -6m = -8m (remember 2 negatives numbers added will give you a bigger negative number so think of it as adding 2 numbers and then putting the negative sign in front of it)
-8m - 6
You cannot simplify it anymore, since it's not like terms
