| 1 | ÷ | 6 | + | ( | 1 | ÷ | 6 | + | 1 | ÷ | 9 | ) | X | = | 1 |
| Left side of the equation = | 1 6 | + | ( | 1 | ÷ | 6 | + | 1 | ÷ | 9 | ) | X |
1 6 | + | ( | 1 | ÷ | 6 | + | 1 | ÷ | 9 | ) | X | = | 1 |
| Left side of the equation = | 1 6 | + | 1 | ÷ | 6 | × | X | + | 1 | ÷ | 9 | × | X |
| = | 1 6 | + | 1 6 | X | + | 1 9 | X |
| = | 1 6 | + | 5 18 | X |
1 6 | + | 5 18 | X | = | 1 |
5 18 | X | = | 1 | − | 1 6 |
5 18 | X | = | 5 6 |
| X | = | 5 6 | ÷ | 5 18 |
| = | 5 6 | × | 18 5 |
| = | 1 | × | 3 |
| X | = | 3 |