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?!!