यदि $f(5)=7$ और $f'(5)=7$ है, तो $\lim_{x \rightarrow 5} \frac{x f(5)-5 f(x)}{x-5}$ का मान ज्ञात कीजिए।

  • A
    $35$
  • B
    -$35$
  • C
    $28$
  • D
    -$28$

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