We have to find the value of x, such that the function:
[tex]f(x)=6x[/tex]takes the value -24. This means that such x has to satisfy:
[tex]\begin{gathered} f(x)=-24 \\ 6x=-24 \end{gathered}[/tex]Now, we just clear out the variable x. We obtain:
[tex]\begin{gathered} x=-\frac{24}{6} \\ x=-4 \end{gathered}[/tex]This means that the value x=-4 makes the function f to be -24.