From the given problem,
[tex]-5w-6=4[/tex]Solving for the value of w,
Add 6 to both sides of the equation
[tex]\begin{gathered} -5w-6+6=4+6 \\ -5w=10 \end{gathered}[/tex]Divide both sides by -5 :
[tex]\begin{gathered} \frac{-5w}{-5}=\frac{10}{-5} \\ w=-2 \end{gathered}[/tex]Now substitute the value of w to the asking expression.
[tex]\begin{gathered} 6w-8=6(-2)-8 \\ =-12-8 \\ =-20 \end{gathered}[/tex]The answer is -20
