| x | x | + | 16 | + | ( | 12 | − | x | ) | ( | 12 | − | x | ) | = | 36 |
| Left side of the equation = | x | x | + | 16 | + | 12 | ( | 12 | − | x | ) | − | x | ( | 12 | − | x | ) |
| = | x | x | + | 16 | + | 12 | × | 12 | − | 12 | x | − | x | ( | 12 | − | x | ) |
| = | x | x | + | 16 | + | 144 | − | 12 | x | − | x | ( | 12 | − | x | ) |
| = | x | x | + | 160 | − | 12 | x | − | x | ( | 12 | − | x | ) |
| = | x | x | + | 160 | − | 12 | x | − | x | × | 12 | + | x | x |
| = | x | x | + | 160 | − | 24 | x | + | x | x |
| x | x | + | 160 | − | 24 | x | + | x | x | = | 36 |