This rule states that the derivative of a sum or difference of functions is the sum or difference of their derivatives. So, we have:
$$\frac{d}{d x}\left(6 x^{2}-5 x+9\right) = \frac{d}{d x}\left(6 x^{2}\right) - \frac{d}{d x}\left(5 x\right) + \frac{d}{d
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