\right. " alt=" \left \{ {{ x^{2} -6x-27\ \textless \ 0} \atop { \frac{x+5}{x-4} \ \textgreater \ 0}}
\right. " align="absmiddle" class="latex-formula">⇔ \{ {{ (x+3)(x-9)\ \textless \ 0} \atop { \frac{x+5}{x-4} \ \textgreater \ 0}} \right. " alt=" \left \{ {{ (x+3)(x-9)\ \textless \ 0} \atop { \frac{x+5}{x-4} \ \textgreater \ 0}} \right. " align="absmiddle" class="latex-formula">⇔
x∈(-3;9) & x∈(-∞;-5)∪(4;+∞) ⇔x∈(4;9)
Ответ: x∈(4;9)