| ( | 3000 | − | 1090 | ) | ÷ | ( | 519 5 | − | X | ) | = | ( | 1000 | − | 1090 | ) | ÷ | ( | 194 5 | − | X | ) |
| 方程两边同时乘以: | ( | 519 5 | − | X | ) | , | ( | 194 5 | − | X | ) |
| ( | 3000 | − | 1090 | ) | ( | 194 5 | − | X | ) | = | ( | 1000 | − | 1090 | ) | ( | 519 5 | − | X | ) |
| 3000 | ( | 194 5 | − | X | ) | − | 1090 | ( | 194 5 | − | X | ) | = | ( | 1000 | − | 1090 | ) | ( | 519 5 | − | X | ) |
| 3000 | ( | 194 5 | − | X | ) | − | 1090 | ( | 194 5 | − | X | ) | = | 1000 | ( | 519 5 | − | X | ) | − | 1090 | ( | 519 5 | − | X | ) |
| 3000 | × | 194 5 | − | 3000 | X | − | 1090 | ( | 194 5 | − | X | ) | = | 1000 | ( | 519 5 | − | X | ) | − | 1090 | ( | 519 5 | − | X | ) |
| 3000 | × | 194 5 | − | 3000 | X | − | 1090 | ( | 194 5 | − | X | ) | = | 1000 | × | 519 5 | − | 1000 | X | − | 1090 | ( | 519 5 | − | X | ) |
| 116400 | − | 3000 | X | − | 1090 | ( | 194 5 | − | X | ) | = | 103800 | − | 1000 | X | − | 1090 | ( | 519 5 | − | X | ) |
| 116400 | − | 3000 | X | − | 1090 | × | 194 5 | + | 1090 | X | = | 103800 | − | 1000 | X | − | 1090 | ( | 519 5 | − | X | ) |
| 116400 | − | 3000 | X | − | 1090 | × | 194 5 | + | 1090 | X | = | 103800 | − | 1000 | X | − | 1090 | × | 519 5 | + | 1090 | X |
| 116400 | − | 3000 | X | − | 42292 | + | 1090 | X | = | 103800 | − | 1000 | X | − | 113142 | + | 1090 | X |
| 74108 | − | 1910 | X | = | - | 9342 | + | 90 | X |
| - | 1910 | X | − | 90 | X | = | - | 9342 | − | 74108 |
| - | 2000 | X | = | - | 9342 | − | 74108 |
| - | 2000 | X | = | - | 83450 |
| 83450 | = | 2000 | X |
| 2000 | X | = | 83450 |
| X | = | 83450 | ÷ | 2000 |
| = | 83450 | × | 1 2000 |
| = | 1669 | × | 1 40 |
| X | = | 1669 40 |
| X | = | 41.725 |