Answer:
26x + 12y + 10z - 12
Step-by-step explanation:
1. Distribute
-4 times 7x = -28x
Negative times a positive equals negative
-4 times -3y = 12y
-4 times -z = 4z
Negative times a negative equal positive
-6 times 9x = 54x
-6 times -z = 6z
-6 times 2 = -12
to get a total of
-28x + 12y + 4z + 54x + 6z - 12
2. Combine like terms
(all z's, y's, x's and constants (1,2,3)
54x - 28x = 26x
4z + 6z = 10z
12y
-12
to get the final answer
