| 1500000 | = | x | ÷ | ( | 4157 500 | × | 373 | ( | 7 200 | − | x | ) | ( | 27 1000 | − | x | ) | ) |
| 方程两边同时乘以: | ( | 4157 500 | × | 373 | ( | 7 200 | − | x | ) | ( | 27 1000 | − | x | ) | ) |
| 1500000 | ( | 4157 500 | × | 373 | ( | 7 200 | − | x | ) | ( | 27 1000 | − | x | ) | ) | = | x |
| 1500000 | × | 4157 500 | × | 373 | ( | 7 200 | − | x | ) | ( | 27 1000 | − | x | ) | = | x |
| 4651683000 | ( | 7 200 | − | x | ) | ( | 27 1000 | − | x | ) | = | x |
| 4651683000 | × | 7 200 | ( | 27 1000 | − | x | ) | − | 4651683000 | x | ( | 27 1000 | − | x | ) | = | x |