[tex]\Large\displaystyle\text{$\begin{gathered} \sf{15x=60 } \end{gathered}$}[/tex]

[tex]\Large\displaystyle\text{$\begin{gathered} \sf{ x=\frac{60}{15}} \end{gathered}$}[/tex]

[tex]\Large\displaystyle\text{$\begin{gathered} \boxed{\boxed{\sf{x=4}} } \end{gathered}$}[/tex]