| 8 | = | a | ( | 0 | + | 2 | ) | ( | 0 | − | 8 | ) |
| Right side of the equation = | a | × | 0 | ( | 0 | − | 8 | ) | + | a | × | 2 | ( | 0 | − | 8 | ) |
| = | a | × | 0 | × | 0 | − | a | × | 0 | × | 8 | + | a | × | 2 | ( | 0 | − | 8 | ) |
| = | a | × | 0 | − | a | × | 0 | + | a | × | 2 | ( | 0 | − | 8 | ) |
| = | 0 | a | + | a | × | 2 | ( | 0 | − | 8 | ) |
| = | a | × | 2 | × | 0 | − | a | × | 2 | × | 8 |
| = | a | × | 0 | − | a | × | 16 |
| = | - | 16 | a |
| 8 | = | - | 16 | a |
| 16 | a | = | - | 8 |
| a | = | - | 8 | ÷ | 16 |
| = | - | 8 | × | 1 16 |
| = | - | 1 | × | 1 2 |
| a | = | - | 1 2 |
| a | = | - 0.5 |