| x | = | 21 2500 | ÷ | ( | 241 100 | − | 141 100 | × | 21 2500 | ) |
| 方程两边同时乘以: | ( | 241 100 | − | 141 100 | × | 21 2500 | ) |
| x | ( | 241 100 | − | 141 100 | × | 21 2500 | ) | = | 21 2500 |
| x | × | 241 100 | − | x | × | 141 100 | × | 21 2500 | = | 21 2500 |
| x | × | 241 100 | − | x | × | 2961 250000 | = | 21 2500 |
599539 250000 | x | = | 21 2500 |
| x | = | 21 2500 | ÷ | 599539 250000 |
| = | 21 2500 | × | 250000 599539 |
| = | 21 | × | 100 599539 |
| x | = | 2100 599539 |
| x | = | 0.003503 |