| ( | 2200 | × | 12 | × | 9 10 | − | 142 | x | × | 7 10 | × | 63 1000 | ) | ÷ | ( | 142 | x | × | 7 20 | ) | = | 19 500 |
| 方程两边同时乘以: | ( | 142 | x | × | 7 20 | ) |
| ( | 2200 | × | 12 | × | 9 10 | − | 142 | x | × | 7 10 | × | 63 1000 | ) | = | 19 500 | ( | 142 | x | × | 7 20 | ) |
| 2200 | × | 12 | × | 9 10 | − | 142 | x | × | 7 10 | × | 63 1000 | = | 19 500 | ( | 142 | x | × | 7 20 | ) |
| 2200 | × | 12 | × | 9 10 | − | 142 | x | × | 7 10 | × | 63 1000 | = | 19 500 | × | 142 | x | × | 7 20 |
| 23760 | − | 31311 5000 | x | = | 9443 5000 | x |
| - | 31311 5000 | x | − | 9443 5000 | x | = | - | 23760 |
| - | 20377 2500 | x | = | - | 23760 |
| 23760 | = | 20377 2500 | x |
20377 2500 | x | = | 23760 |
| x | = | 23760 | ÷ | 20377 2500 |
| = | 23760 | × | 2500 20377 |
| x | = | 59400000 20377 |
| x | = | 2915.051283 |