a) \(\displaystyle{{ - 8} \over 3} + {{ - 1} \over 3} < ... < {{ - 2} \over 7} + {{ - 5} \over 7}\)
\(\Rightarrow \displaystyle{{ - 9} \over 3} < x < {{ - 7} \over 7}\) hay \(-3 < x <1\)
\(\Rightarrow x = -2.\)
b) \(\displaystyle{{ - 5} \over 6} + {8 \over 3} + {{29} \over { - 6}} \le x \le {{ - 1} \over 2} + 2 + {5 \over 2}\)
\(\Rightarrow \displaystyle{{ - 5} \over 6} + {16 \over 6} + {{-29} \over { 6}} \le x \)\(\displaystyle\le {{ - 1} \over 2} + \dfrac{4}{2} + {5 \over 2}\)
\(\displaystyle \Rightarrow \) \(\displaystyle{{ - 18} \over 6} \le x \le \dfrac{8}{2}\)
\(\displaystyle \Rightarrow -3 ≤ x ≤ 4\)
\(\displaystyle \Rightarrow \) \(\displaystyle{{x}} \in \left\{ { - 3; - 2; - 1;0;1;2;3;4} \right\}\)
