| x | ( | 1 | − | 5 100 | ) | − | 50 | − | 25000 | ÷ | 1000 | = | x | × | 20 100 |
| 方程左边 = | x | ( | 1 | − | 5 100 | ) | − | 50 | − | 25 |
| = | x | ( | 1 | − | 5 100 | ) | − | 75 |
| x | ( | 1 | − | 5 100 | ) | − | 75 | = | x | × | 20 100 |
| 方程左边 = | x | × | 1 | − | x | × | 5 100 | − | 75 |
| = | 19 20 | x | − | 75 |
19 20 | x | − | 75 | = | x | × | 20 100 |
19 20 | x | − | 20 100 | x | = | 75 |
3 4 | x | = | 75 |
| x | = | 75 | ÷ | 3 4 |
| = | 75 | × | 4 3 |
| = | 25 | × | 4 |
| x | = | 100 |