SOLUTION: please help solve Factor by grouping r^2-9TW+3RW-3RT

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Question 64789: please help solve
Factor by grouping
r^2-9TW+3RW-3RT
Answer by 303795(562) About Me  (Show Source):
You can put this solution on YOUR website!
r%5E2-9tw%2B3rw-3rt
Rearrange
r%5E2%2B3rw-3rt-9tw
Take a common factor from the first two terms and take a common factor from the third and fourth terms.
r%28r%2B3w%29-3t%28r%2B3w%29
Take a common factor of (r+3w) from each term to get
%28r%2B3w%29%28r-3t%29