Решите уравнение: (2-7x)(5+4x)=0

\[\ (2 - 7x)(5 + 4x) = 0\]

\[2 - 7x = 0\]

\[- 7x = - 2\]

\[x = \frac{2}{7}\]

\[5 + 4x = 0\]

\[4x = - 5\]

\[x = - \frac{5}{4} = - 1\frac{1}{4}\]

\[Ответ:\ \ x = \frac{2}{7}\ \ и\ \ x = - 1\frac{1}{4}.\]