\[- 1 < 3\ \ \ | + 4\]
\[- 1 + 4 < 3 + 4\]
\[3 < 7\]
\[- 1 < 3\ \ \ \ \ \ | + ( - 2)\]
\[- 1 + ( - 2) < 3 + ( - 2)\]
\[- 3 < 1.\]