Найдите сумму всех цельх решений совокушности неравенств \( \left[\begin{array}{l}x^{2}-2 x-8 \leq 0, \\ x^{2}-6 x-7>0\end{array}\right. \) на промежутке \( [-12 ; 9] \).

\( \left. \begin{array} { l }{ y - 29 = 81 } \\ { y - 29 + \ldots = 81 + 29 } \\ { y = } \end{array} \right. \)

Evaluate the expression when \( a=6 \) and \( b=27 \). \[ b-4 a \] \( \square \) \begin{tabular}{ccc}\hline\( \square \) & 5 \\ \hline\end{tabular}

Simplify the following: (1) \( \frac{x-1}{x^{2}+3 x+2} \div\left[\frac{x-3}{x+1}-\frac{x-4}{x+2}\right] \) (2) \( \frac{\frac{6 x+5}{x-5}}{\frac{3 x+20}{x-5}+2} \) (3) \( \frac{a^{2}+\left(1-a^{2}\right)}{(1+a) a} \times \frac{(1+a) a}{a^{2}-\left(1-a^{2}\right)} \)

Simplify. \( 6 v+3 v \)

\( x + 5 y \)