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[tex]d/dx(f(3x^5)) = 8x^2 [/tex]

Find [tex]f'(x)[/tex]

After applying the chain rule:

[tex]f'(3x^5)(15x^4) = 8x^2[/tex]

[tex]f'(3x^5) = 8/(15x^2) [/tex]

It's not apparent to me how I proceed from here to find [tex]f'(x)[/tex]. I tried dividing the expression on the right by three and taking the fifth root but that does not seem to be right. Any help would be appreciated!