Chapter 2 - Equations, Inequalities, and Problem Solving - 2.1 Solving Equations - 2.1 Exercise Set - Page 87: 102

$-412$

Using the properties of equality, the value of $ n $ in the given equation, $ n+268=124 $, is \begin{array}{l} n+268-268=124-268 \\\\ n=-144 .\end{array} Hence, $n-268$ evaluates to \begin{array}{l} -144-268 \\\\= -412 .\end{array}