| ( | 14 | − | 2 | x | ) | ( | 12 | − | 2 | x | ) | = | 192 |
| Left side of the equation = | 14 | ( | 12 | − | 2 | x | ) | − | 2 | x | ( | 12 | − | 2 | x | ) |
| = | 14 | × | 12 | − | 14 | × | 2 | x | − | 2 | x | ( | 12 | − | 2 | x | ) |
| = | 168 | − | 28 | x | − | 2 | x | ( | 12 | − | 2 | x | ) |
| = | 168 | − | 28 | x | − | 2 | x | × | 12 | + | 2 | x | × | 2 | x |
| = | 168 | − | 28 | x | − | 24 | x | + | 4 | x | x |
| = | 168 | − | 52 | x | + | 4 | x | x |
| 168 | − | 52 | x | + | 4 | x | x | = | 192 |