\[x + 35 - 6x^{2} \leq 0\]
\[6x^{2} - x - 35 \geq 0\]
\[D = 1 + 840 = 841 = 29^{2}\]
\[x_{1} = \frac{1 + 29}{12} = \frac{30}{12} = \frac{5}{2} = 2,5;\]
\[x_{2} = \frac{1 - 29}{12} = - \frac{28}{12} = - \frac{7}{3} = - 2\frac{1}{3}.\]
\[\left( x + 2\frac{1}{3} \right)(x - 2,5) \geq 0\]
\[x \leq - 2\frac{1}{3};x \geq 2,5.\]
\[Ответ:x \leq - 2\frac{1}{3};x \geq 2,5.\]