\[\boxed{\mathbf{4.}\mathbf{45}}\]
\[\textbf{а)}\ Z = \{ - 8;\ - 7\}\]
\[\textbf{б)}\ Z = \{ - 3;\ - 2;\ - 1\}\]
\[\textbf{в)}\ Z = \{ - 2;\ - 1;0;1;2\}\]
\[\textbf{д)}\ Z = \{ 1;2;3\}\]
\[\textbf{е)}\ Z = \{ 5;6\}\]
\[\textbf{ж)}\ Z = \{ - 9;\ - 8;\ - 7\}\]