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If graph of `y=f(x)` is symmetrical about the point `(5,0)` and `f^(prime)(7)=3,` then the value of `f^(prime)(3)` is__________

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We have f(5-x)=-f(5+x)or -f'(5-x)=-f'(5+x)
`"or "f'(5-2)=f'(5+2)or f'(3)=f'(7)=3`
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