[tex]\bf{Move \ the \ negative \ symbol \ to \ the \ left. }[/tex]
[tex]\boldsymbol{\sf{-\dfrac{10n}{5}=-4 \ \ \longmapsto \ \ [Split] }}[/tex]
[tex]\boldsymbol{\sf{-2n=-4 }}[/tex]
[tex]\bf{Divide \ both \ sides \ by \ -2. }[/tex]
[tex]\boldsymbol{\sf{n=\dfrac{-4}{-2} }}[/tex]
[tex]\bf{Two \ negatives \ make \ a \ positive. }[/tex]
[tex]\boldsymbol{\sf{n=\dfrac{4}{2} \ \ \longmapsto \ \ [Split] }}[/tex]
[tex]\blue{\boxed{\boldsymbol{\sf{Answer \ \ \longmapsto \ \underline{n=2}}}}}[/tex]
