Answer:
-2x-7y-7z
Explanation:
I'm going to start off by separating the different variables and keeping the sign in front with it.
(5x-3x-4x) + (-6y+2y-3y) + (-7z-z+z)
After that it's simply solving a simplifying.
(-2x) + (-7y) + (-7z)
And your final answer should be...
-2x - 7y - 7z!
Hope I helped!