Resposta:

[tex]x + 13 = 54 \\ x = 54 - 13 \\ x = 41[/tex]

[tex]\Large\displaystyle\text{$\begin{gathered} \sf{x+13=54 } \end{gathered}$}[/tex]

[tex]\Large\displaystyle\text{$\begin{gathered} \sf{x=54-13 } \end{gathered}$}[/tex]

[tex]\Large\displaystyle\text{$\begin{gathered} \boxed{\boxed{\sf{ x=41} }}\end{gathered}$}[/tex]