Answer:
a - 6b - 6c
Explanation:
Okay so we are subtracting the first expression from the second which would be (6a + b - 9c) - (-6a - 7b + 3c)
so you would subtract the a expressions from each other, the b expressions from each other and the c expressions from each other it would be:
6a - 6a = a
b - 7b = - 6b
3c - 9c = -6c
now we put it back into the expression which would be :
a - 6b - 6c
Hope this helps you
