[tex]{ \longmapsto{ \sf{7n - 4 = 31}}}[/tex]
[tex]{ \longmapsto{ \sf{7n = 31 + 4}}}[/tex]
[tex]{ \longmapsto{ \sf{7n = 35}}}[/tex]
[tex]{ \longmapsto{ \sf{n = \frac{35}{7} }}}[/tex]
[tex]{ \longmapsto{ \sf{n = \cancel\frac{35}{7} }}}[/tex]
[tex]{ \color{blue}{ \longmapsto{ \sf{n = 5 }}}}[/tex]
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