| ( | 4 | X | + | 1 | ) | ( | 4 | X | + | 1 | ) | − | 8 | ( | 2 | X | X | − | 1 | ) | = | 0 |
| Left side of the equation = | 4 | X | ( | 4 | X | + | 1 | ) | + | 1 | ( | 4 | X | + | 1 | ) | − | 8 | ( | 2 | X | X | − | 1 | ) |
| = | 4 | X | × | 4 | X | + | 4 | X | × | 1 | + | 1 | ( | 4 | X | + | 1 | ) | − | 8 | ( | 2 | X | X | − | 1 | ) |
| = | 16 | X | X | + | 4 | X | + | 1 | ( | 4 | X | + | 1 | ) | − | 8 | ( | 2 | X | X | − | 1 | ) |
| = | 16 | X | X | + | 4 | X | + | 1 | × | 4 | X | + | 1 | × | 1 | − | 8 | ( | 2 | X | X | − | 1 | ) |
| = | 16 | X | X | + | 4 | X | + | 4 | X | + | 1 | − | 8 | ( | 2 | X | X | − | 1 | ) |
| = | 16 | X | X | + | 8 | X | + | 1 | − | 8 | ( | 2 | X | X | − | 1 | ) |
| = | 16 | X | X | + | 8 | X | + | 1 | − | 8 | × | 2 | X | X | + | 8 | × | 1 |
| = | 16 | X | X | + | 8 | X | + | 1 | − | 16 | X | X | + | 8 |
| = | 16 | X | X | + | 8 | X | + | 9 | − | 16 | X | X |
| 16 | X | X | + | 8 | X | + | 9 | − | 16 | X | X | = | 0 |
| X= | - | 9 8 |