Question

n/3-8=-2

Answer 1

\[\frac{ n }{ 3 }-8=-2\]
\[\frac{ n }{ 3 }-8+8=-2+8\]
\[\frac{ n }{ 3 }=6\]
\[\frac{ n }{ 3 }*3=6*3\]
\[n=18\]

Answer 2

If you meant this:
\[\frac{ n }{ 3 - 8 } = 2\]
then
\[n = 2(3- 8) = 6 - 16 = -10\]
otherwise @apple_pi is right