If the zeroes of the rational expression \( (3 x+2 a) \) \( (2 x+1) \) are \( \frac{-1}{2} \) an...

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If the zeroes of the rational expression \( (3 x+2 a) \) \( (2 x+1) \) are \( \frac{-1}{2} \) and \( \frac{b}{3} \), then the value of \( a \) is
(a) \( -2 b \)
(b) \( \frac{-b}{2} \)
(c) \( \frac{-b}{3} \)
(d) None of these
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