| ( | 9450 | ÷ | ( | 102000 | + | x | ) | ) | × | 100 | = | 7 100 |
| 9450 | ÷ | ( | 102000 | + | x | ) | × | 100 | = | 7 100 |
| 945000 | ÷ | ( | 102000 | + | x | ) | = | 7 100 |
| 方程两边同时乘以: | ( | 102000 | + | x | ) |
| 945000 | = | 7 100 | ( | 102000 | + | x | ) |
| 945000 | = | 7 100 | × | 102000 | + | 7 100 | x |
| 945000 | = | 7140 | + | 7 100 | x |
| - | 7 100 | x | = | 7140 | − | 945000 |
| - | 7 100 | x | = | - | 937860 |
| 937860 | = | 7 100 | x |
7 100 | x | = | 937860 |
| x | = | 937860 | ÷ | 7 100 |
| = | 937860 | × | 100 7 |
| = | 133980 | × | 100 |
| x | = | 13398000 |