Answer:
6x - 7y?
Step-by-step explanation:
2x3y + 8xy - 4x2y - 16y
10x11y - 4x2y - 16y
6x9y - 16y
6x - 7y
(I'm also confused by this problem, but I tried to provide my viewpoint of how I'd solve it)
(Feel free to ask questions or ask for clarifications)