| 1 | ÷ | 15 | + | 1 | ÷ | 3 | + | ( | 1 | ÷ | 15 | + | 1 | ÷ | 12 | ) | x | = | 1 |
| Left side of the equation = | 1 15 | + | 1 3 | + | ( | 1 | ÷ | 15 | + | 1 | ÷ | 12 | ) | x |
| = | 2 5 | + | ( | 1 | ÷ | 15 | + | 1 | ÷ | 12 | ) | x |
2 5 | + | ( | 1 | ÷ | 15 | + | 1 | ÷ | 12 | ) | x | = | 1 |
| Left side of the equation = | 2 5 | + | 1 | ÷ | 15 | × | x | + | 1 | ÷ | 12 | × | x |
| = | 2 5 | + | 1 15 | x | + | 1 12 | x |
| = | 2 5 | + | 3 20 | x |
2 5 | + | 3 20 | x | = | 1 |
3 20 | x | = | 1 | − | 2 5 |
3 20 | x | = | 3 5 |
| x | = | 3 5 | ÷ | 3 20 |
| = | 3 5 | × | 20 3 |
| = | 1 | × | 4 |
| x | = | 4 |