we multiply each term of the parenthesis by -9
[tex]\begin{gathered} 5w+(6w\times-9)+(9\times-9) \\ 5w-54w-81 \end{gathered}[/tex]simplify doing the subtract between terms with w
[tex]\begin{gathered} (5-54)w-81 \\ -49w-81 \end{gathered}[/tex]Solution
[tex]-49w-81[/tex]