15 100 | + | x% | + | 15 100 | × | x% | = | 13 200 |
| 方程左边 = | 15 100 | + | x% | + | 3 2000 | x |
15 100 | + | x% | + | 3 2000 | x | = | 13 200 |
| x% | + | 3 2000 | x | = | 13 200 | − | 15 100 |
23 2000 | x | = | 13 200 | − | 15 100 |
23 2000 | x | = | - | 17 200 |
| x | = | - | 17 200 | ÷ | 23 2000 |
| = | - | 17 200 | × | 2000 23 |
| = | - | 17 | × | 10 23 |
| x | = | - | 170 23 |
| x | = | - 7.391304 |