| ( | 1 10 | − | x | ) | ( | 1 20 | − | x | ) | ÷ | x | = | 9 500000 |
| 方程两边同时乘以: | x |
| ( | 1 10 | − | x | ) | ( | 1 20 | − | x | ) | = | 9 500000 | x |
1 10 | ( | 1 20 | − | x | ) | − | x | ( | 1 20 | − | x | ) | = | 9 500000 | x |
1 10 | × | 1 20 | − | 1 10 | x | − | x | ( | 1 20 | − | x | ) | = | 9 500000 | x |
1 200 | − | 1 10 | x | − | x | ( | 1 20 | − | x | ) | = | 9 500000 | x |
1 200 | − | 1 10 | x | − | x | × | 1 20 | + | x | x | = | 9 500000 | x |
1 200 | − | 3 20 | x | + | x | x | = | 9 500000 | x |