Answer:
[tex]w=\frac{30-5z}{4}[/tex]
Step-by-step explanation:
[tex]4w+5z=30\\\\4w+5z-5z=30-5z\\\\4w=30-5z\\\\\frac{4w=30-5z}{4}\\\\\boxed{w=\frac{30-5z}{4}}[/tex]
Hope this helps.
