High School Math help please. Will provide first, correct answer with 10 points?

Please explain answer so I can learn how to do problem.



http://www.flickr.com/photos/29312441@N0
-3.8*9*r -3.8*4 7.6*3*r 7.6*6 (distribute the -3.8 into the first two terms and 7.6 into last two terms)

= -34.2*r - 15.2 22.8*r 45.6 (perform products of numbers)

= -34.2*r 22.8*r -15.2 45.6 (group like terms - those with r