Пожалуйста помогите очень срочно нужно система уравнений

Решите задачу:

$1)\; \left \{ {{x^2-2x-15 \leq 0} \atop {x^2-12x+27\ \textless \ 0}} \right. \; \left \{ {{(x-5)(x+3) \leq 0} \atop {(x-3)(x-9)\ \textless \ 0}} \right. \; \; \left \{ {{+++[-3]---[5]+++} \atop {+++(3)---(9)+++}} \right. \\\\ \left \{ {{x\in [-3,5\, ]} \atop {x\in (-\infty ,3)\cup (9,+\infty )}} \right. \; \; \to \; \; x\in [-3,3\, )$

$2)\; \; \left \{ {{x^2+6x+16 \leq 0} \atop {-x^2+x+20\ \textgreater \ 0}} \right. \; \left \{ {{x\in \varnothing } \atop {-(x+4)(x-5)\ \textgreater \ 0}} \right. \; \left \{ {{x\in \varnothing } \atop {x\in (-4,5)}} \right. \; \; \to \; \; x\in \varnothing \\\\3)\; \; \left \{ {{-x^2+x+10 \geq -2} \atop {x^2-3x-8\ \textless \ 2}} \right. \; \left \{ {{x^2-x-12 \leq 0} \atop {x^2-3x-10\ \textless \ 0}} \right. \; \left \{ {{(x+3)(x-4) \leq 0} \atop {(x+2)(x-5)\ \textless \ 0}} \right. \\\\ \left \{ {{x\in [-3,4\, ]} \atop {x\in (-2,5)}} \right. \; \to \; x\in [-3,4\, ]$