7. For the equation $7 x^{2}-(k+13) x+k^{2}-k-2=0$ with respect to $x$, if its two roots lie within $(0,1)$ and $(1,2)$ respectively, the range of real number $k$ is $\qquad$ .
7. $30 \\ f(1)0,\end{array}\right.$ solving yields $-2<k<-1$ or $3<k<4$.