\[Страница\ 26.\]
\[\boxed{\mathbf{4}.}\]
\[\textbf{а)}\ (144 - x) + 36 = 100\]
\[144 - x = 100 - 36\]
\[144 - x = 64\]
\[x = 144 - 64\]
\[x = 80.\]
\[Проверка.\]
\[(144 - 80) + 36 = 100\]
\[64 + 36 = 100\]
\[100 = 100.\]
\[Ответ:x = 80.\]
\[\textbf{б)}\ (63 + x) - 29 = 117\]
\[63 + x = 117 + 29\]
\[63 + x = 146\]
\[x = 146 - 63\]
\[x = 83.\]
\[Проверка.\]
\[(63 + 83) - 29 = 117\]
\[146 - 29 = 117\]
\[117 = 117.\]
\[Ответ:\ x = 83.\]
\[\boxed{\mathbf{5}.}\]
\[(19 - 5) - x = 6\]
\[14 - x = 6\]
\[x = 14 - 6\]
\[x = 8\ (конфет) - взяла\ Света.\]
\[Ответ:8\ конфет.\]