\[\ \frac{12x^{2} + x}{x} = 0\]
\[\frac{x(12x + 1)}{x} = 0\]
\[12x + 1 = 0\]
\[12x = - 1\]
\[x = - \frac{1}{12}\]
\[ОДЗ:\ \ x
eq 0\]
\[Ответ:\ x = - \frac{1}{12}.\]
\[a > 0;\ \ \ \ \ c < 0\]
\[\ a^{7}c^{8} > 0\]
\[a^{7} > 0;\ \ \ \ c^{8} > 0\ \]