| ( | 44 | − | x | ) | ( | 880 | + | 5 | x | ) | = | 1600 |
| Left side of the equation = | 44 | ( | 880 | + | 5 | x | ) | − | x | ( | 880 | + | 5 | x | ) |
| = | 44 | × | 880 | + | 44 | × | 5 | x | − | x | ( | 880 | + | 5 | x | ) |
| = | 38720 | + | 220 | x | − | x | ( | 880 | + | 5 | x | ) |
| = | 38720 | + | 220 | x | − | x | × | 880 | − | x | × | 5 | x |
| = | 38720 | − | 660 | x | − | x | × | 5 | x |
| 38720 | − | 660 | x | − | x | × | 5 | x | = | 1600 |