[tex]\Large\displaystyle\text{$\begin{gathered} \sf{ x+5=8} \end{gathered}$}[/tex]

[tex]\Large\displaystyle\text{$\begin{gathered} \sf{x=8-5 } \end{gathered}$}[/tex]

[tex]\Large\displaystyle\text{$\begin{gathered} \boxed{\boxed{\sf{x=3}} } \end{gathered}$}[/tex]