Respuesta :

Hello,

First, you distribute: 
−7x+(−3)(9)+(−3)(−7x) and it turns into −7x+−27+21x

Next, you must combine like terms:
 −7x+−27+21x = (−7x+21x)+(−27) = 14x+−27

So, 14x-27 is your total answer.

I hope I helped :)