Hey there!☺
[tex]Answer:\boxed{8n-9}[/tex]
[tex]Explanation:[/tex]
[tex]-2n-1(9-10n)[/tex]
Step 1: Distribute.
[tex]-2n+(-1)(9)+(-1)(-10n)\\-2n+-9+10n[/tex]
Step 2: Combine like terms.
[tex](-2n+10n)+(-9)[/tex]
Answer:
[tex]8n-9[/tex]
Hope this helps!☺
