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[tex]w(x) = \frac{1}{6} x - 3 \\ [/tex]
[tex]w(x) = - 4[/tex]
Thus ;
[tex] \frac{1}{6} x - 3 = - 4 \\ [/tex]
Add sides 3
[tex] \frac{1}{6} x - 3 + 3 = - 4 + 3 \\ [/tex]
[tex] \frac{1}{6} x = - 1 \\ [/tex]
Multiply sides by 6
[tex]6 \times \frac{1}{6} x = 6 \times( - 1) \\ [/tex]
[tex]x = - 6[/tex]
Done...
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