\[(4y + 6)(1,8 - 0,2y) = 0\]
\[1)\ 4y + 6 = 0\]
\[4y = - 6\]
\[y = - 6\ :4\]
\[y = - 1,5.\]
\[2)\ 1,8 - 0,2y = 0\]
\[0,2y = 1,8\]
\[y = 1,8\ :0,2 = 18\ :2\]
\[y = 9.\]
\[Ответ:y = - 1,5;y = 9.\]