Let the function, $\mathrm{f}:[-7,0] \rightarrow \mathrm{R}$ be continuous on $[- 7,0]$ and differentiable on $(-7,0)$. If $f(-7)=-3$ and $\mathrm{f}^{\prime}(\mathrm{x}) \leq 2$, for all $\mathrm{x} \in(-7,0)$, then for all such functions $f, f(-1)+f(0)$ lies in the interval
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