Answer:
[tex]3 y - 3 z[/tex]
Step-by-step explanation:
[tex]-(z-y+2x)-2(-x-y+z)[/tex]
[tex]-z+y-2x+2x+2y-2z[/tex]
Group similar terms together
[tex]-2x+2x+y+2y-2z-z[/tex]
adding similar terms
