\[\boxed{\mathbf{882\ (882)}\mathbf{.}\mathbf{\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[\textbf{а)}\ 0,5x + 3 = 9\]
\[0,5x = 9 - 3\]
\[0,5x = 6\]
\[x = 6\ :0,5\]
\[x = 6\ :\frac{1}{2}\]
\[x = 6 \bullet 2\]
\[x = 12.\]
\[Ответ:x = 12.\]
\[\textbf{б)}\frac{1}{3}x - 2 = 0\]
\[\frac{1}{3}x = 0 + 2\]
\[\frac{1}{3}x = 2\]
\[x = 2\ :\frac{1}{3}\]
\[x = 2 \bullet 3\]
\[x = 6.\]
\[Ответ:x = 6.\]