Answer:
-2x + 8y - 5z
Explanation:
-1/2*4x = -2x
-1/2 * - 16y = 8y
-1/2 * 10z = - 5z
Combine
-2x + 8y - 5z
If you break the question apart like this, you will never get confused by what the signs do. What is left for signs is what you put in the answer.