| ( | 2404 | − | 1000 | ) | ÷ | ( | 3000 | − | 2404 | ) | = | ( | X | − | 194 5 | ) | ÷ | ( | 519 5 | − | X | ) |
| 方程两边同时乘以: | ( | 3000 | − | 2404 | ) | , | ( | 519 5 | − | X | ) |
| ( | 2404 | − | 1000 | ) | ( | 519 5 | − | X | ) | = | ( | X | − | 194 5 | ) | ( | 3000 | − | 2404 | ) |
| 2404 | ( | 519 5 | − | X | ) | − | 1000 | ( | 519 5 | − | X | ) | = | ( | X | − | 194 5 | ) | ( | 3000 | − | 2404 | ) |
| 2404 | ( | 519 5 | − | X | ) | − | 1000 | ( | 519 5 | − | X | ) | = | X | ( | 3000 | − | 2404 | ) | − | 194 5 | ( | 3000 | − | 2404 | ) |
| 2404 | × | 519 5 | − | 2404 | X | − | 1000 | ( | 519 5 | − | X | ) | = | X | ( | 3000 | − | 2404 | ) | − | 194 5 | ( | 3000 | − | 2404 | ) |
| 2404 | × | 519 5 | − | 2404 | X | − | 1000 | ( | 519 5 | − | X | ) | = | X | × | 3000 | − | X | × | 2404 | − | 194 5 | ( | 3000 | − | 2404 | ) |
1247676 5 | − | 2404 | X | − | 1000 | ( | 519 5 | − | X | ) | = | X | × | 3000 | − | X | × | 2404 | − | 194 5 | ( | 3000 | − | 2404 | ) |
1247676 5 | − | 2404 | X | − | 1000 | ( | 519 5 | − | X | ) | = | 596 | X | − | 194 5 | ( | 3000 | − | 2404 | ) |
1247676 5 | − | 2404 | X | − | 1000 | × | 519 5 | + | 1000 | X | = | 596 | X | − | 194 5 | ( | 3000 | − | 2404 | ) |
1247676 5 | − | 2404 | X | − | 1000 | × | 519 5 | + | 1000 | X | = | 596 | X | − | 194 5 | × | 3000 | + | 194 5 | × | 2404 |
1247676 5 | − | 2404 | X | − | 103800 | + | 1000 | X | = | 596 | X | − | 116400 | + | 466376 5 |
728676 5 | − | 1404 | X | = | 596 | X | − | 115624 5 |
| - | 1404 | X | − | 596 | X | = | - | 115624 5 | − | 728676 5 |
| - | 2000 | X | = | - | 115624 5 | − | 728676 5 |
| - | 2000 | X | = | - | 168860 |
| 168860 | = | 2000 | X |
| 2000 | X | = | 168860 |
| X | = | 168860 | ÷ | 2000 |
| = | 168860 | × | 1 2000 |
| = | 8443 | × | 1 100 |
| X | = | 8443 100 |
| X | = | 84.43 |