The given expression is (-18n) - 64n.
It can be simplified by taking outside the common factor -2. Hence,
[tex]\begin{gathered} \mleft(-18n\mright)-64n=-2\times9n-2\times32n \\ =-2(9n+32n) \end{gathered}[/tex]Therefore, the given expression is equivalent to -2(9n+32n).
