| ( | 19549 100 | − | X | ) | ÷ | X | = | 371 1000 |
| 方程两边同时乘以: | X |
| ( | 19549 100 | − | X | ) | = | 371 1000 | X |
19549 100 | − | X | = | 371 1000 | X |
| - | X | − | 371 1000 | X | = | - | 19549 100 |
| - | 1371 1000 | X | = | - | 19549 100 |
19549 100 | = | 1371 1000 | X |
1371 1000 | X | = | 19549 100 |
| X | = | 19549 100 | ÷ | 1371 1000 |
| = | 19549 100 | × | 1000 1371 |
| = | 19549 | × | 10 1371 |
| X | = | 195490 1371 |
| X | = | 142.589351 |