| 8 | ÷ | 18 | + | ( | ( | 1 | ÷ | 18 | ) | + | ( | 1 | ÷ | 12 | ) | ) | x | = | 1 |
| 方程左边 = | 4 9 | + | ( | ( | 1 | ÷ | 18 | ) | + | ( | 1 | ÷ | 12 | ) | ) | x |
4 9 | + | ( | ( | 1 | ÷ | 18 | ) | + | ( | 1 | ÷ | 12 | ) | ) | x | = | 1 |
| 方程左边 = | 4 9 | + | ( | 1 | ÷ | 18 | ) | x | + | ( | 1 | ÷ | 12 | ) | x |
| = | 4 9 | + | 1 | ÷ | 18 | × | x | + | ( | 1 | ÷ | 12 | ) | x |
| = | 4 9 | + | 1 18 | x | + | ( | 1 | ÷ | 12 | ) | x |
| = | 4 9 | + | 1 18 | x | + | 1 | ÷ | 12 | × | x |
| = | 4 9 | + | 1 18 | x | + | 1 12 | x |
| = | 4 9 | + | 5 36 | x |
4 9 | + | 5 36 | x | = | 1 |
5 36 | x | = | 1 | − | 4 9 |
5 36 | x | = | 5 9 |
| x | = | 5 9 | ÷ | 5 36 |
| = | 5 9 | × | 36 5 |
| = | 1 | × | 4 |
| x | = | 4 |