| ( | 1 | ÷ | 10 | ) | x | + | ( | 1 | ÷ | 15 | ) | ( | 9 | − | x | ) | = | 1 |
| 方程左边 = | 1 | ÷ | 10 | × | x | + | ( | 1 | ÷ | 15 | ) | ( | 9 | − | x | ) |
| = | 1 10 | x | + | ( | 1 | ÷ | 15 | ) | ( | 9 | − | x | ) |
| = | 1 10 | x | + | 1 | ÷ | 15 | × | ( | 9 | − | x | ) |
| = | 1 10 | x | + | 1 15 | ( | 9 | − | x | ) |
| = | 1 10 | x | + | 1 15 | × | 9 | − | 1 15 | x |
| = | 1 10 | x | + | 3 5 | − | 1 15 | x |
| = | 1 30 | x | + | 3 5 |
1 30 | x | + | 3 5 | = | 1 |
1 30 | x | = | 1 | − | 3 5 |
1 30 | x | = | 2 5 |
| x | = | 2 5 | ÷ | 1 30 |
| = | 2 5 | × | 30 |
| = | 2 | × | 6 |
| x | = | 12 |