\[\boxed{\text{991.\ }\text{еуроки}\text{-}\text{ответы}\text{\ }\text{на}\text{\ }\text{пятёрку}}\]
\[\textbf{а)} - 3 < 2x - 1 < 3\]
\[- 3 + 1 < 2x < 3 + 1\]
\[- 2 < 2x < 4\ \ \ |\ :2\]
\[- 1 < x < 2\]
\[( - 1;2)\]
\[\textbf{б)} - 12 < 5 - x < 17\]
\[5 - ( - 12) > x > 5 - 17\]
\[17 > x > - 12\]
\[- 12 < x < 17\]
\[( - 12;17)\]
\[\textbf{в)}\ 2 < 6 - 2y < 5\]
\[2 - 6 < - 2y < 5 - 6\]
\[- 4 < - 2y < - 1\ \ \ |\ :( - 2)\]
\[2 > y > 0,5\]
\[0,5 < y < 2\]
\[(0,5;2)\]
\[\textbf{г)} - 1 < 5y + 4 < 19\]
\[- 1 - 4 < 5y < 19 - 4\]
\[- 5 < 5y < 15\ \ \ \ \ |\ :5\]
\[- 1 < y < 3\]
\[( - 1;3)\ \]