The sum of the coefficients of $x^{32}$ and $x^{-31}$ in $\left(x^4-\frac{1}{x^3}\right)^{15}$ is $\left(x^4-\frac{1}{x^3}\right)^{15}$

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The sum of the coefficients of $x^{32}$ and $x^{-31}$ in $\left(x^4-\frac{1}{x^3}\right)^{15}$ is…