| 16 | × | 16 | − | ( | 10 | + | x | ) | ( | 10 | + | x | ) | = | 10 | × | 10 | − | x | x |
| Left side of the equation = | 256 | − | ( | 10 | + | x | ) | ( | 10 | + | x | ) |
| 256 | − | ( | 10 | + | x | ) | ( | 10 | + | x | ) | = | 10 | × | 10 | − | x | x |
| Left side of the equation = | 256 | − | 10 | ( | 10 | + | x | ) | − | x | ( | 10 | + | x | ) |
| = | 256 | − | 10 | × | 10 | − | 10 | x | − | x | ( | 10 | + | x | ) |
| = | 256 | − | 100 | − | 10 | x | − | x | ( | 10 | + | x | ) |
| = | 156 | − | 10 | x | − | x | ( | 10 | + | x | ) |
| = | 156 | − | 10 | x | − | x | × | 10 | − | x | x |
| = | 156 | − | 20 | x | − | x | x |
| 156 | − | 20 | x | − | x | x | = | 10 | × | 10 | − | x | x |
| Right side of the equation = | 100 | − | x | x |
| 156 | − | 20 | x | − | x | x | = | 100 | − | x | x |
| x= | 14 5 |