| ( | x | − | 12 100 | ) | ÷ | ( | 14 100 | − | 12 100 | ) | = | ( | 12 5 | − | 12009 5000 | ) | ÷ | ( | 1451 625 | − | 12009 5000 | ) |
| 方程两边同时乘以: | ( | 14 100 | − | 12 100 | ) | , | ( | 1451 625 | − | 12009 5000 | ) |
| ( | x | − | 12 100 | ) | ( | 1451 625 | − | 12009 5000 | ) | = | ( | 12 5 | − | 12009 5000 | ) | ( | 14 100 | − | 12 100 | ) |
| x | ( | 1451 625 | − | 12009 5000 | ) | − | 12 100 | ( | 1451 625 | − | 12009 5000 | ) | = | ( | 12 5 | − | 12009 5000 | ) | ( | 14 100 | − | 12 100 | ) |
| x | ( | 1451 625 | − | 12009 5000 | ) | − | 12 100 | ( | 1451 625 | − | 12009 5000 | ) | = | 12 5 | ( | 14 100 | − | 12 100 | ) | − | 12009 5000 | ( | 14 100 | − | 12 100 | ) |
| x | × | 1451 625 | − | x | × | 12009 5000 | − | 12 100 | ( | 1451 625 | − | 12009 5000 | ) | = | 12 5 | ( | 14 100 | − | 12 100 | ) | − | 12009 5000 | ( | 14 100 | − | 12 100 | ) |
| x | × | 1451 625 | − | x | × | 12009 5000 | − | 12 100 | ( | 1451 625 | − | 12009 5000 | ) | = | 12 5 | × | 14 100 | − | 12 5 | × | 12 100 | − | 12009 5000 | ( | 14 100 | − | 12 100 | ) |
| x | × | 1451 625 | − | x | × | 12009 5000 | − | 12 100 | ( | 1451 625 | − | 12009 5000 | ) | = | 42 125 | − | 36 125 | − | 12009 5000 | ( | 14 100 | − | 12 100 | ) |
| - | 401 5000 | x | − | 12 100 | ( | 1451 625 | − | 12009 5000 | ) | = | 6 125 | − | 12009 5000 | ( | 14 100 | − | 12 100 | ) |
| - | 401 5000 | x | − | 12 100 | × | 1451 625 | + | 12 100 | × | 12009 5000 | = | 6 125 | − | 12009 5000 | ( | 14 100 | − | 12 100 | ) |
| - | 401 5000 | x | − | 12 100 | × | 1451 625 | + | 12 100 | × | 12009 5000 | = | 6 125 | − | 12009 5000 | × | 14 100 | + | 12009 5000 | × | 12 100 |
| - | 401 5000 | x | − | 4353 15625 | + | 36027 125000 | = | 6 125 | − | 84063 250000 | + | 36027 125000 |