You can put this solution on YOUR website! start with the -(-3)
multiplying that you will get 3 for 2 negetive you get a positive.
(3)-7(6-3) subtract the 6 and the 3
(3)-7(3) now multiply the 7 and the 3
3-21 for I left the 3 in ( ) just to keep it out of the way.
-18 is your answer and you are right