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puppies22
Hey!
For 6, I got C because you wouldn't do 15-3 first because you have to follow PEMDAS, so multiplying -3 to x and 2 would come first. 
so it would be 15-3x-6
and now you simplify
-3x + 9
or 9-3x
Hope this helps!

(If you are the same person who asked for 10 and 13 as well, just tell me because I was trying to answer you question but it deleted and I copied the answer I wrote!)
bayleecase2002
Hey! 

The answer should be 9 - 3x because - 3 distributes to x and 2 changing the equation to 15 - 3x - 6 which simplifies to 9 - 3x

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