જો $f(5)=7$ અને $f'(5)=7$ હોય,તો $\lim_{x \rightarrow 5} \frac{x f(5)-5 f(x)}{x-5}$ ની કિંમત શોધો.

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

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