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Answer:
[tex]x = \dfrac{z - y^2}{3a}[/tex]
Step-by-step explanation:
7y⁴ = 7y²(z - 3ax)
Divide both sides by 7y².
y² = z - 3ax
Add 3ax to both sides. Subtract y² from both sides.
3ax = z - y²
Divide both sides by 3a.
[tex]x = \dfrac{z - y^2}{3a}[/tex]