| 1 | ÷ | 15 | × | 3 | + | ( | 1 | ÷ | 15 | + | 1 | ÷ | 9 | ) | x | = | 1 |
| 方程左边 = | 1 5 | + | ( | 1 | ÷ | 15 | + | 1 | ÷ | 9 | ) | x |
1 5 | + | ( | 1 | ÷ | 15 | + | 1 | ÷ | 9 | ) | x | = | 1 |
| 方程左边 = | 1 5 | + | 1 | ÷ | 15 | × | x | + | 1 | ÷ | 9 | × | x |
| = | 1 5 | + | 1 15 | x | + | 1 9 | x |
| = | 1 5 | + | 8 45 | x |
1 5 | + | 8 45 | x | = | 1 |
8 45 | x | = | 1 | − | 1 5 |
8 45 | x | = | 4 5 |
| x | = | 4 5 | ÷ | 8 45 |
| = | 4 5 | × | 45 8 |
| = | 1 | × | 9 2 |
| x | = | 9 2 |
| x | = | 4.5 |