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![f(x)=\ln(1-5x)\\\\f'(x)=\left[\ln(1-5x)\right]'=\dfrac{1}{1-5x}\cdot(1-5x)'=\dfrac{1}{1-5x}\cdot(-5)=-\dfrac{5}{1-5x}\\\\Used:\\\\(\ln(x))'=\dfrac{1}{x}\\\\\left[g(f(x))]\right]'=g'(f(x))\cdot f'(x)](/tpl/images/0042/0271/82d3f.png)
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If f(x) = ln(1 − 5x), then find f '(x)....
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