| ( | 1 | ÷ | 2 | ÷ | ( | 1 | − | a | ) | ) | ( | 1 | ÷ | 2 | ÷ | ( | 1 | − | a | ) | ) | + | 1 | ÷ | ( | 4 | a | ) | × | ( | 2 | − | a | ) | ÷ | ( | 1 | − | a | ) | = | 0 |
| Multiply both sides of the equation by: | ( | 4 | a | ) |
| ( | 1 | ÷ | 2 | ÷ | ( | 1 | − | a | ) | ) | ( | 1 | ÷ | 2 | ÷ | ( | 1 | − | a | ) | ) | ( | 4 | a | ) | + | 1 | ( | 2 | − | a | ) | ÷ | ( | 1 | − | a | ) | = | 0 |
| 1 | ÷ | 2 | ÷ | ( | 1 | − | a | ) | × | ( | 1 | ÷ | 2 | ÷ | ( | 1 | − | a | ) | ) | ( | 4 | a | ) | + | 1 | ( | 2 | − | a | ) | ÷ | ( | 1 | − | a | ) | = | 0 |
1 2 | ÷ | ( | 1 | − | a | ) | × | ( | 1 | ÷ | 2 | ÷ | ( | 1 | − | a | ) | ) | ( | 4 | a | ) | + | 1 | ( | 2 | − | a | ) | ÷ | ( | 1 | − | a | ) | = | 0 |
| Multiply both sides of the equation by: | ( | 1 | − | a | ) |
1 2 | ( | 1 | ÷ | 2 | ÷ | ( | 1 | − | a | ) | ) | ( | 4 | a | ) | + | 1 | ( | 2 | − | a | ) | = | 0 |
1 2 | × | 1 | ÷ | 2 | ÷ | ( | 1 | − | a | ) | × | ( | 4 | a | ) | + | 1 | ( | 2 | − | a | ) | = | 0 |
1 4 | ÷ | ( | 1 | − | a | ) | × | ( | 4 | a | ) | + | 1 | ( | 2 | − | a | ) | = | 0 |
| Multiply both sides of the equation by: | ( | 1 | − | a | ) |
1 4 | ( | 4 | a | ) | + | 1 | ( | 2 | − | a | ) | ( | 1 | − | a | ) | = | 0 |
1 4 | × | 4 | a | + | 1 | ( | 2 | − | a | ) | ( | 1 | − | a | ) | = | 0 |
| 1 | a | + | 1 | ( | 2 | − | a | ) | ( | 1 | − | a | ) | = | 0 |
| 1 | a | + | 1 | × | 2 | ( | 1 | − | a | ) | − | 1 | a | ( | 1 | − | a | ) | = | 0 |
| 1 | a | + | 2 | ( | 1 | − | a | ) | − | 1 | a | ( | 1 | − | a | ) | = | 0 |
| 1 | a | + | 2 | × | 1 | − | 2 | a | − | 1 | a | ( | 1 | − | a | ) | = | 0 |
| 1 | a | + | 2 | − | 2 | a | − | 1 | a | ( | 1 | − | a | ) | = | 0 |
| - | 1 | a | + | 2 | − | 1 | a | ( | 1 | − | a | ) | = | 0 |
| - | 1 | a | + | 2 | − | 1 | a | × | 1 | + | 1 | a | a | = | 0 |
| - | 1 | a | + | 2 | − | 1 | a | + | 1 | a | a | = | 0 |
| - | 2 | a | + | 2 | + | 1 | a | a | = | 0 |