\[\boxed{\mathbf{4.}\mathbf{166}}\]
\[\textbf{а)} - 3 + 6 = 3\]
\[\textbf{б)}\ 4 + ( - 3) = 1\]
\[\textbf{в)} - 10 + 12 = 2\]
\[\textbf{г)} - 9 + 0 = - 9\]
\[\textbf{д)}\ 6 + ( - 6) = 0\]
\[\textbf{е)} - 7 + ( - 6) = - 13\]
\[\textbf{ж)}\ 0 + ( - 5) = - 5\]
\[\textbf{з)} - 3 + ( - 4) = - 7\]