-1/3 (n + 15) = -2
1/3 is a fraction not 1 divided by three :)
\(-\frac{1}{3}(n+15)=-2\)
\(-\frac{n}{3}-5=-2\)
\(-\frac{n}{3}=3\)
\(n=-9\)
!
+18 
!
