If \( (x-3) \) and \( \left(x-\frac{1}{3}\right) \) are both factors of \( a x^{2}+5 x+b \), the...

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If \( (x-3) \) and \( \left(x-\frac{1}{3}\right) \) are both factors of \( a x^{2}+5 x+b \), then show that \( a=b \).
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