9 10 | × | 657 25 | × | 390 | × | 60 | + | 377 20 | × | 390 | ( | x | − | 60 | ) | = | - | ( | 660 | × | 509 | ( | 5 4 | x | − | 195 | ) | ) | ÷ | ( | 5 4 | x | ) | − | 420000000 |
| 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 | − | 195 | ) | ) | − | 420000000 | ( | 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 | − | 195 | ) | ) | − | 420000000 | ( | 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 | − | 195 | ) | − | 420000000 | ( | 5 4 | x | ) |
| 691821 | x | + | 14703 2 | ( | x | − | 60 | ) | ( | 5 4 | x | ) | = | - | 335940 | ( | 5 4 | x | − | 195 | ) | − | 420000000 | ( | 5 4 | x | ) |
| 691821 | x | + | 14703 2 | x | ( | 5 4 | x | ) | − | 14703 2 | × | 60 | ( | 5 4 | x | ) | = | - | 335940 | ( | 5 4 | x | − | 195 | ) | − | 420000000 | ( | 5 4 | x | ) |
| 691821 | x | + | 14703 2 | x | ( | 5 4 | x | ) | − | 14703 2 | × | 60 | ( | 5 4 | x | ) | = | - | 335940 | × | 5 4 | x | + | 335940 | × | 195 | − | 420000000 | ( | 5 4 | x | ) |
| 691821 | x | + | 14703 2 | x | ( | 5 4 | x | ) | − | 441090 | ( | 5 4 | x | ) | = | - | 419925 | x | + | 65508300 | − | 420000000 | ( | 5 4 | x | ) |
| 691821 | x | + | 14703 2 | x | × | 5 4 | x | − | 441090 | ( | 5 4 | x | ) | = | - | 419925 | x | + | 65508300 | − | 420000000 | ( | 5 4 | x | ) |
| 691821 | x | + | 14703 2 | x | × | 5 4 | x | − | 441090 | ( | 5 4 | x | ) | = | - | 419925 | x | + | 65508300 | − | 420000000 | × | 5 4 | x |
| 691821 | x | + | 73515 8 | x | x | − | 441090 | ( | 5 4 | x | ) | = | - | 419925 | x | + | 65508300 | − | 525000000 | x |
| 691821 | x | + | 73515 8 | x | x | − | 441090 | ( | 5 4 | x | ) | = | - | 525419925 | x | + | 65508300 |
| 691821 | x | + | 73515 8 | x | x | − | 441090 | × | 5 4 | x | = | - | 525419925 | x | + | 65508300 |
| 691821 | x | + | 73515 8 | x | x | − | 1102725 2 | x | = | - | 525419925 | x | + | 65508300 |
280917 2 | x | + | 73515 8 | x | x | = | - | 525419925 | x | + | 65508300 |