JEE Math Practice Question
Let $a$ and $b$ be two nonzero real numbers. If the coefficient of $x^{5}$ in the expansion of $\left(a x^{2}+\frac{70}{27 b x}\right)^{4}$ is equal to the coefficient of $x^{-5}$ in the expansion of $\left(a x-\frac{1}{b x^{2}}\right)^{7}$, then the value of $2 b$ is
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