\[\boxed{\text{119\ (119).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[\textbf{а)}\ 0,5 \cdot (x + 6) = 7\]
\[0,5x + 3 = 7\]
\[0,5x = 7 - 3\]
\[0,5x = 4\]
\[x = 4\ :0,5\]
\[x = 40\ :5\]
\[x = 8\]
\[Ответ:x = 8.\]
\[\textbf{б)}\ 0,1x + 10 = 8,8\]
\[0,1x = 8,8 - 10\]
\[0,1x = - 1,2\]
\[x = - 1,2\ :0,1\]
\[x = - 12\ :1\]
\[x = - 12\]
\[Ответ:x = - 12.\]