Answer:
[tex]\bold{x=\frac{-6+z}6=-1+\frac z6}[/tex]
Step-by-step explanation:
[tex]\bold{x-6+5x=-12+z}\\{}\quad +6\qquad\quad\ +6\\{\quad}\bold{6x\ =\ -6+z}\\{}\quad\div6\quad\ \ \div6\\{}\quad \bold{x=\frac{-6+z}6=-1+\frac z6}[/tex]
