| ( | 60 | − | 2 | x | ) | ( | 22 | − | 2 | x | ) | = | 600 |
| Left side of the equation = | 60 | ( | 22 | − | 2 | x | ) | − | 2 | x | ( | 22 | − | 2 | x | ) |
| = | 60 | × | 22 | − | 60 | × | 2 | x | − | 2 | x | ( | 22 | − | 2 | x | ) |
| = | 1320 | − | 120 | x | − | 2 | x | ( | 22 | − | 2 | x | ) |
| = | 1320 | − | 120 | x | − | 2 | x | × | 22 | + | 2 | x | × | 2 | x |
| = | 1320 | − | 120 | x | − | 44 | x | + | 4 | x | x |
| = | 1320 | − | 164 | x | + | 4 | x | x |
| 1320 | − | 164 | x | + | 4 | x | x | = | 600 |