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Simple algebraic simplification problem after a u-substitution derivation

The attached file contains a function that needs to have the first order derivative taken. I took the derivative, but I am making a mistake in the algebra simplification of the result. Would you please take a look.


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There's a mistake in your partner's work:
<br>From ... f '(x) = 4x + [ (2/5) * (18-x) ...