Answer:
[tex]z = \frac{5}{8} \\ [/tex]
Step-by-step explanation:
[tex]9z + (7z-4)=6 \\ 9z + 7z - 4 = 6 \\ 16z = 6 + 4 \\ 16z = 10 \\ z = \frac{10}{16} \\ \\ z = \frac{5}{8} [/tex]
