The given equation is-
[tex]cy+h=-7[/tex]First, we subtract h on each side.
[tex]\begin{gathered} cy+h-h=-7-h \\ cy=-7-h \end{gathered}[/tex]Then, we divide the equation by c.
[tex]\begin{gathered} \frac{cy}{c}=\frac{-7-h}{c} \\ y=\frac{-7-h}{c} \end{gathered}[/tex]