| - | 2 | × | 3 | × | 1 | − | 9 | × | 1 | − | 5 | − | ( | - | 5 | × | 3 | × | 1 | ) | − | 3 | × | 9 | + | 1 | = | a |
| Left side of the equation = | - | 6 | − | 9 | − | 5 | − | ( | - | 5 | × | 3 | × | 1 | ) | − | 27 | + | 1 |
| = | - | 46 | − | ( | - | 5 | × | 3 | × | 1 | ) |
| - | 46 | − | ( | - | 5 | × | 3 | × | 1 | ) | = | a |
| Left side of the equation = | - | 46 | + | 5 | × | 3 | × | 1 |
| = | - | 46 | + | 15 |
| = | - | 31 |
| - | 31 | = | a |
| - | a | = | 31 |
| - | 31 | = | a |
| a | = | - | 31 |