| x | = | ( | ( | 1 | + | 20 100 | ) | − | ( | 1 | − | 20 100 | ) | ) | ÷ | ( | 1 | − | 20 100 | ) |
| Multiply both sides of the equation by: | ( | 1 | − | 20 100 | ) |
| x | ( | 1 | − | 20 100 | ) | = | ( | ( | 1 | + | 20 100 | ) | − | ( | 1 | − | 20 100 | ) | ) |
| x | × | 1 | − | x | × | 20 100 | = | ( | ( | 1 | + | 20 100 | ) | − | ( | 1 | − | 20 100 | ) | ) |
| x | × | 1 | − | x | × | 20 100 | = | ( | 1 | + | 20 100 | ) | − | ( | 1 | − | 20 100 | ) |
4 5 | x | = | ( | 1 | + | 20 100 | ) | − | ( | 1 | − | 20 100 | ) |
4 5 | x | = | 1 | + | 20 100 | − | ( | 1 | − | 20 100 | ) |
4 5 | x | = | 6 5 | − | ( | 1 | − | 20 100 | ) |
4 5 | x | = | 6 5 | − | 1 | + | 20 100 |
4 5 | x | = | 2 5 |
| x | = | 2 5 | ÷ | 4 5 |
| = | 2 5 | × | 5 4 |
| = | 1 | × | 1 2 |
| x | = | 1 2 |
| x | = | 0.5 |