Answer :
[tex]31=-\frac{1}{6}n[/tex]
start by multiplyind each side by 9
[tex]31\cdot6=-\frac{1}{6}n\cdot6[/tex]simplify
[tex]186=-n[/tex]divide by -1 on both sides and simplify
[tex]\begin{gathered} \frac{186}{-1}=-\frac{n}{-1} \\ -186=n \end{gathered}[/tex]