15 100 | = | ( | x | − | 123 100 | ) | ÷ | x% |
| 方程两边同时乘以: | x% |
15 100 | × | x% | = | ( | x | − | 123 100 | ) |
15 100 | × | x% | = | x | − | 123 100 |
3 2000 | x | = | x | − | 123 100 |
3 2000 | x | − | x | = | - | 123 100 |
| - | 1997 2000 | x | = | - | 123 100 |
123 100 | = | 1997 2000 | x |
1997 2000 | x | = | 123 100 |
| x | = | 123 100 | ÷ | 1997 2000 |
| = | 123 100 | × | 2000 1997 |
| = | 123 | × | 20 1997 |
| x | = | 2460 1997 |
| x | = | 1.231848 |