| 1500 | − | 1500 | ÷ | ( | 28 5 | x | ) | × | 1 5 | x | − | 27 5 | x | = | 0 |
| 方程两边同时乘以: | ( | 28 5 | x | ) |
| 1500 | ( | 28 5 | x | ) | − | 1500 | × | 1 5 | x | − | 27 5 | x | ( | 28 5 | x | ) | = | 0 |
| 1500 | × | 28 5 | x | − | 1500 | × | 1 5 | x | − | 27 5 | x | ( | 28 5 | x | ) | = | 0 |
| 8400 | x | − | 300 | x | − | 27 5 | x | ( | 28 5 | x | ) | = | 0 |
| 8100 | x | − | 27 5 | x | ( | 28 5 | x | ) | = | 0 |
| 8100 | x | − | 27 5 | x | × | 28 5 | x | = | 0 |
| 8100 | x | − | 756 25 | x | x | = | 0 |
| x= | 1875 7 |