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So by using the chain rule, i can get:

(-4/3)((9x-2)

^{2}/(12x-5)

^{2})

and by using the quotient rule, i can get the final answer, which is:

(2(-36x-8)(-36x-15)

^{2}-2(-36x-15)(-36x-8)

^{2})

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(-36x-15)

^{4}

The answer that i got here is wrong, but i don't know, why?