Assuming you would like to create a portfolio with $7$ assets having the following returns: $-3x,-2x,-x,0,x,2x,$ and $3x.$ What is the value of $x,$ given that you aim for a portfolio with a standard deviation return of $7\mathrm{.}87?($round your final answer to $1$ decimal place: $20\mathrm{.}456-->20\mathrm{.}5)$

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