$\frac{(x^2+2x)-(3x+6)}{x-3}=0$ $(x\neq3)$
$=>(x^2+2x)-(3x+6)=0$
$=>x(x+2)-3(x+2)=0$
$=>(x-3)(x+2)=0$
\(=>\left[ \begin{array}{l}x-3=0=>x=3\\x+2=0=>x=-2\end{array} \right.\)
Vậy $S=${$-2$}
Đáp án: $S =$ { $-2$ }
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