Remember that
If a value of x is a solution to an equation, the value of x must satisfy the equation
For x=4
substitute in the equation
[tex]\begin{gathered} \frac{6x}{8}=3 \\ \\ \frac{6(4)}{8}=3 \\ \\ \frac{24}{8}=3 \\ 3=3\text{ ----> is ok} \end{gathered}[/tex]