| 4 | × | 3 | X | − | 3 | ( | 3 | X | + | 3 | ) | = | 2 | X | + | 2 |
| Left side of the equation = | 12 | X | − | 3 | ( | 3 | X | + | 3 | ) |
| 12 | X | − | 3 | ( | 3 | X | + | 3 | ) | = | 2 | X | + | 2 |
| Left side of the equation = | 12 | X | − | 3 | × | 3 | X | − | 3 | × | 3 |
| = | 12 | X | − | 9 | X | − | 9 |
| = | 3 | X | − | 9 |
| 3 | X | − | 9 | = | 2 | X | + | 2 |
| 3 | X | − | 2 | X | = | 2 | + | 9 |
| X | = | 2 | + | 9 |
| X | = | 2 | + | 9 |
| X | = | 11 |