Let \( p x^{4}+q x^{3}+r x^{2}+s x+t=\left|\begin{array}{ccc}x^{2}+...

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Let \( p x^{4}+q x^{3}+r x^{2}+s x+t=\left|\begin{array}{ccc}x^{2}+3 x & x-1 & x+3 \\ x+1 & -2 x & x-4 \\ x-3 & x+4 & 3 x\end{array}\right| \) be an identify, where \( p, q, r, s \) and \( t \) are constants, then the value of \( s \) is equal to
 
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