9 10 | × | 657 25 | × | 390 | × | 60 | + | 377 20 | × | 390 | ( | x | − | 60 | ) | = | - | 660 | × | 509 | ( | 5 4 | x | − | 390 | ÷ | 2 | ) | ÷ | ( | 5 4 | x | ) |
| 方程两边同时乘以: | ( | 5 4 | x | ) |
9 10 | × | 657 25 | × | 390 | × | 60 | ( | 5 4 | x | ) | + | 377 20 | × | 390 | ( | x | − | 60 | ) | ( | 5 4 | x | ) | = | - | 660 | × | 509 | ( | 5 4 | x | − | 390 | ÷ | 2 | ) |
9 10 | × | 657 25 | × | 390 | × | 60 | × | 5 4 | x | + | 377 20 | × | 390 | ( | x | − | 60 | ) | ( | 5 4 | x | ) | = | - | 660 | × | 509 | ( | 5 4 | x | − | 390 | ÷ | 2 | ) |
9 10 | × | 657 25 | × | 390 | × | 60 | × | 5 4 | x | + | 377 20 | × | 390 | ( | x | − | 60 | ) | ( | 5 4 | x | ) | = | - | 660 | × | 509 | × | 5 4 | x | + | 660 | × | 509 | × | 390 | ÷ | 2 |
| 691821 | x | + | 14703 2 | ( | x | − | 60 | ) | ( | 5 4 | x | ) | = | - | 419925 | x | + | 65508300 |
| 691821 | x | + | 14703 2 | x | ( | 5 4 | x | ) | − | 14703 2 | × | 60 | ( | 5 4 | x | ) | = | - | 419925 | x | + | 65508300 |
| 691821 | x | + | 14703 2 | x | ( | 5 4 | x | ) | − | 441090 | ( | 5 4 | x | ) | = | - | 419925 | x | + | 65508300 |
| 691821 | x | + | 14703 2 | x | × | 5 4 | x | − | 441090 | ( | 5 4 | x | ) | = | - | 419925 | x | + | 65508300 |
| 691821 | x | + | 73515 8 | x | x | − | 441090 | ( | 5 4 | x | ) | = | - | 419925 | x | + | 65508300 |
| 691821 | x | + | 73515 8 | x | x | − | 441090 | × | 5 4 | x | = | - | 419925 | x | + | 65508300 |
| 691821 | x | + | 73515 8 | x | x | − | 1102725 2 | x | = | - | 419925 | x | + | 65508300 |
280917 2 | x | + | 73515 8 | x | x | = | - | 419925 | x | + | 65508300 |