Let f(x)=(7xx−10)\displaystyle {f{{\left({x}\right)}}}={\left({\frac{{{7}{x}}}{{{x}-{10}}}}\right)}
Then f′(1)=\displaystyle {f}'{\left({1}\right)}=   .
And after simplifying f′(x)=\displaystyle {f}'{\left({x}\right)}=   .

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