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I have a question which want to derivative $\left(\frac{3x-2}{5x}\right)$ what I get is $\left(\frac{3\left(5x\right)-5\left(3x-2\right)}{\left(5x\right)^2}\right)$ then $\left(\frac{15x-15x+10}{\left(5x\right)^2}\right)$ and finally $\left(\frac{10}{\left(5x\right)^2}\right)$

BUT the correct answer is $\frac{2}{5x^2}$

how it's come?!!

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    $\begingroup$ Don't forget to expand the square $(5x)^2$, then simplify the fraction. You should get the same answer. $\endgroup$ – Nicholas Nov 17 '15 at 15:40
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    $\begingroup$ Hey, I was about to type that. $\endgroup$ – Pieter21 Nov 17 '15 at 15:41
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You are not wrong because $$\frac{10}{(5x)^2} = \frac{2}{5x^2} $$

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    $\begingroup$ That's an easy bunch of points. $\endgroup$ – marty cohen Nov 17 '15 at 17:06
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    $\begingroup$ @martycohen this answer is dedicated to all the complexe answers which never get upvoted $\endgroup$ – stity Nov 17 '15 at 17:23

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