Resposta:   5

Explicação passo a passo:

5x-2=23

5x=23+2

5x=25

x=25/5

x=5

[tex]\Large\displaystyle\text{$\begin{gathered} \sf{5x-2=23 } \end{gathered}$}[/tex]

[tex]\Large\displaystyle\text{$\begin{gathered} \sf{5x=23+2 } \end{gathered}$}[/tex]

[tex]\Large\displaystyle\text{$\begin{gathered} \sf{ 5x=25} \end{gathered}$}[/tex]

[tex]\Large\displaystyle\text{$\begin{gathered} \sf{x=\frac{25}{ 5}} \end{gathered}$}[/tex]

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