If \( \log _{(2 x+3)}\left(6 x^{2}+23 x+21\right)=4-\log _{(3 x+7)}...

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If \( \log _{(2 x+3)}\left(6 x^{2}+23 x+21\right)=4-\log _{(3 x+7)}\left(4 x^{2}+12 x+9\right) \) then value of \( x \) is equal to
(A) \( \frac{3}{4} \)
(B) \( -\frac{3}{4} \)
(C) \( -\frac{1}{4} \)
(D) \( \frac{3}{2} \)
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