| x | − | 8 100 | ÷ | ( | 9 100 | − | 8 100 | ) | = | ( | 1 5 | − | 429 2000 | ) | ÷ | ( | 223 1250 | − | 429 2000 | ) |
| 方程两边同时乘以: | ( | 9 100 | − | 8 100 | ) | , | ( | 223 1250 | − | 429 2000 | ) |
| x | ( | 9 100 | − | 8 100 | ) | ( | 223 1250 | − | 429 2000 | ) | − | 8 100 | ( | 223 1250 | − | 429 2000 | ) | = | ( | 1 5 | − | 429 2000 | ) | ( | 9 100 | − | 8 100 | ) |
| x | × | 9 100 | ( | 223 1250 | − | 429 2000 | ) | − | x | × | 8 100 | ( | 223 1250 | − | 429 2000 | ) | − | 8 100 | ( | 223 1250 | − | 429 2000 | ) | = | ( | 1 5 | − | 429 2000 | ) | ( | 9 100 | − | 8 100 | ) |
| x | × | 9 100 | ( | 223 1250 | − | 429 2000 | ) | − | x | × | 8 100 | ( | 223 1250 | − | 429 2000 | ) | − | 8 100 | ( | 223 1250 | − | 429 2000 | ) | = | 1 5 | ( | 9 100 | − | 8 100 | ) | − | 429 2000 | ( | 9 100 | − | 8 100 | ) |
| x | × | 9 100 | × | 223 1250 | − | x | × | 9 100 | × | 429 2000 | − | x | × | 8 100 | ( | 223 1250 | − | 429 2000 | ) | − | 8 100 | ( | 223 1250 | − | 429 2000 | ) | = | 1 5 | ( | 9 100 | − | 8 100 | ) | − | 429 2000 | ( | 9 100 | − | 8 100 | ) |
| x | × | 9 100 | × | 223 1250 | − | x | × | 9 100 | × | 429 2000 | − | x | × | 8 100 | ( | 223 1250 | − | 429 2000 | ) | − | 8 100 | ( | 223 1250 | − | 429 2000 | ) | = | 1 5 | × | 9 100 | − | 1 5 | × | 8 100 | − | 429 2000 | ( | 9 100 | − | 8 100 | ) |
| x | × | 2007 125000 | − | x | × | 3861 200000 | − | x | × | 8 100 | ( | 223 1250 | − | 429 2000 | ) | − | 8 100 | ( | 223 1250 | − | 429 2000 | ) | = | 9 500 | − | 2 125 | − | 429 2000 | ( | 9 100 | − | 8 100 | ) |