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Let $r$ and $c$ be real numbers. If $r$ and $-r$ are roots of $5 x^{3}+c x^{2}-10 x+9=0$, then $c$ equals

  1. $4$
  2. $-4$
  3. $-\frac{9}{2}$
  4. $\frac{9}{2}$

     

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