If \( f(x)=2 x^{3}-a x^{2}+3 x+7 \) attains its maximum \( \mathrm{...

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If \( f(x)=2 x^{3}-a x^{2}+3 x+7 \) attains its maximum
\( \mathrm{P} \)
value at \( x=-2 \), then find the value of \( a \).
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