\[\boxed{\mathbf{1048\ (1039)}\mathbf{.}\mathbf{\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[1) - \frac{5}{1}x = 0\]
\[x = 0\]
\[Ответ:0.\]
\[2)\ 5,4 \cdot (x + 6,3) = 0\]
\[x + 6,3 = 0\]
\[x = - 6,3\]
\[Ответ:\ - 6,3.\]
\[3)\ (x - 3)(x + 4) = 0\]
\[x - 3 = 0\ \ \ \ \ \ \ \ x + 4 = 0\]
\[x = 3\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ x = - 4.\]
\[Ответ:\ - 4;\ \ 3.\]
\[4)\ 23,5|x| = 0\]
\[|x| = 0\]
\[x = 0\]
\[Ответ:0.\]