| ( | ( | 1 | + | X | + | 3 20 | ) | ÷ | ( | 1 | + | X | ) | − | 1 | ) | = | 3 50 | ÷ | 3 5 |
| ( | 1 | + | X | + | 3 20 | ) | ÷ | ( | 1 | + | X | ) | − | 1 | = | 3 50 | ÷ | 3 5 |
| ( | 1 | + | X | + | 3 20 | ) | ÷ | ( | 1 | + | X | ) | − | 1 | = | 1 10 |
| Multiply both sides of the equation by: | ( | 1 | + | X | ) |
| ( | 1 | + | X | + | 3 20 | ) | − | 1 | ( | 1 | + | X | ) | = | 1 10 | ( | 1 | + | X | ) |
| 1 | + | X | + | 3 20 | − | 1 | ( | 1 | + | X | ) | = | 1 10 | ( | 1 | + | X | ) |
| 1 | + | X | + | 3 20 | − | 1 | ( | 1 | + | X | ) | = | 1 10 | × | 1 | + | 1 10 | X |
| 1 | + | X | + | 3 20 | − | 1 | ( | 1 | + | X | ) | = | 1 10 | + | 1 10 | X |
23 20 | + | X | − | 1 | ( | 1 | + | X | ) | = | 1 10 | + | 1 10 | X |
23 20 | + | X | − | 1 | × | 1 | − | 1 | X | = | 1 10 | + | 1 10 | X |
23 20 | + | X | − | 1 | − | 1 | X | = | 1 10 | + | 1 10 | X |
3 20 | + | 0 | X | = | 1 10 | + | 1 10 | X |
| - | 1 10 | X | = | 1 10 | − | 3 20 |
| - | 1 10 | X | = | - | 1 20 |
1 20 | = | 1 10 | X |
1 10 | X | = | 1 20 |
| X | = | 1 20 | ÷ | 1 10 |
| = | 1 20 | × | 10 |
| = | 1 2 | × | 1 |
| X | = | 1 2 |
| X | = | 0.5 |