Resposta:  6

Explicação passo a passo:

3x-2=16

3x=16+2

3x=18

x=18/3

x=6

[tex]\Large\displaystyle\text{$\begin{gathered} \sf{3x-2=16 } \end{gathered}$}[/tex]

[tex]\Large\displaystyle\text{$\begin{gathered} \sf{3x=16+2 } \end{gathered}$}[/tex]

[tex]\Large\displaystyle\text{$\begin{gathered} \sf{3x=18 } \end{gathered}$}[/tex]

[tex]\Large\displaystyle\text{$\begin{gathered} \sf{ x=\frac{18}{3}} \end{gathered}$}[/tex]

[tex]\Large\displaystyle\text{$\begin{gathered} \boxed{\boxed{\sf{x=6 }}} \end{gathered}$}[/tex]