| ( | 110 | − | x | ) | ( | 41 | − | 2 | x | ) | = | 3570 |
| Left side of the equation = | 110 | ( | 41 | − | 2 | x | ) | − | x | ( | 41 | − | 2 | x | ) |
| = | 110 | × | 41 | − | 110 | × | 2 | x | − | x | ( | 41 | − | 2 | x | ) |
| = | 4510 | − | 220 | x | − | x | ( | 41 | − | 2 | x | ) |
| = | 4510 | − | 220 | x | − | x | × | 41 | + | x | × | 2 | x |
| = | 4510 | − | 261 | x | + | x | × | 2 | x |
| 4510 | − | 261 | x | + | x | × | 2 | x | = | 3570 |