| ( | 14 100 | − | X | ) | ÷ | ( | 14 100 | − | 15 100 | ) | = | ( | 12367 2500 | − | X | ) | ÷ | ( | 12367 2500 | + | 37101 5000 | ) |
| 方程两边同时乘以: | ( | 14 100 | − | 15 100 | ) | , | ( | 12367 2500 | + | 37101 5000 | ) |
| ( | 14 100 | − | X | ) | ( | 12367 2500 | + | 37101 5000 | ) | = | ( | 12367 2500 | − | X | ) | ( | 14 100 | − | 15 100 | ) |
14 100 | ( | 12367 2500 | + | 37101 5000 | ) | − | X | ( | 12367 2500 | + | 37101 5000 | ) | = | ( | 12367 2500 | − | X | ) | ( | 14 100 | − | 15 100 | ) |
14 100 | ( | 12367 2500 | + | 37101 5000 | ) | − | X | ( | 12367 2500 | + | 37101 5000 | ) | = | 12367 2500 | ( | 14 100 | − | 15 100 | ) | − | X | ( | 14 100 | − | 15 100 | ) |
14 100 | × | 12367 2500 | + | 14 100 | × | 37101 5000 | − | X | ( | 12367 2500 | + | 37101 5000 | ) | = | 12367 2500 | ( | 14 100 | − | 15 100 | ) | − | X | ( | 14 100 | − | 15 100 | ) |
14 100 | × | 12367 2500 | + | 14 100 | × | 37101 5000 | − | X | ( | 12367 2500 | + | 37101 5000 | ) | = | 12367 2500 | × | 14 100 | − | 12367 2500 | × | 15 100 | − | X | ( | 14 100 | − | 15 100 | ) |
86569 125000 | + | 259707 250000 | − | X | ( | 12367 2500 | + | 37101 5000 | ) | = | 86569 125000 | − | 37101 50000 | − | X | ( | 14 100 | − | 15 100 | ) |
| X= | 47367 250000 |