Let $P(x)$ be real polynomial of degree 3 which vanishes at $x=-3$. Let $P(x)$ have local minima at $x=1$, local maxima at $x=-1$ and $\int_{-1}^1 P(x) d x=18$, then the sum of all the coefficients of the polynomial $P(x)$ is equal to $\_\_\_\_$ .
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