Решите уравнение (14у+21)(1,8-0,3y)=0.

\[(14y + 21) \cdot (1,8 - 0,3y) = 0\]

\[14y + 21 = 0\ \ \ \ \ \ или\ \ \ \ \ \ 1,8 - 0,3y = 0\]

\[14y = - 21\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ 0,3y = 1,8\]

\[y = - \frac{21}{14}\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ y = 6.\]

\[y = - \frac{3}{2}\]

\[y = - 1\frac{1}{2}.\]

\[Ответ:\ y = - 1,5;y = 6.\ \]