| 18 | = | 11 20 | × | 27 25 | ÷ | ( | x | − | 2 25 | ) |
| 方程两边同时乘以: | ( | x | − | 2 25 | ) |
| 18 | ( | x | − | 2 25 | ) | = | 11 20 | × | 27 25 |
| 18 | x | − | 18 | × | 2 25 | = | 11 20 | × | 27 25 |
| 18 | x | − | 36 25 | = | 297 500 |
| 18 | x | = | 297 500 | + | 36 25 |
| 18 | x | = | 1017 500 |
| x | = | 1017 500 | ÷ | 18 |
| = | 1017 500 | × | 1 18 |
| = | 113 500 | × | 1 2 |
| x | = | 113 1000 |
| x | = | 0.113 |