| x | ÷ | ( | 10 | − | 2 | x | ) | ÷ | ( | 10 | − | 2 | x | ) | = | 71 1000 |
| 方程两边同时乘以: | ( | 10 | − | 2 | x | ) |
| x | ÷ | ( | 10 | − | 2 | x | ) | = | 71 1000 | ( | 10 | − | 2 | x | ) |
| x | ÷ | ( | 10 | − | 2 | x | ) | = | 71 1000 | × | 10 | − | 71 1000 | × | 2 | x |
| x | ÷ | ( | 10 | − | 2 | x | ) | = | 71 100 | − | 71 500 | x |
| 方程两边同时乘以: | ( | 10 | − | 2 | x | ) |
| x | = | 71 100 | ( | 10 | − | 2 | x | ) | − | 71 500 | x | ( | 10 | − | 2 | x | ) |
| x | = | 71 100 | × | 10 | − | 71 100 | × | 2 | x | − | 71 500 | x | ( | 10 | − | 2 | x | ) |
| x | = | 71 10 | − | 71 50 | x | − | 71 500 | x | ( | 10 | − | 2 | x | ) |
| x | = | 71 10 | − | 71 50 | x | − | 71 500 | x | × | 10 | + | 71 500 | x | × | 2 | x |
| x | = | 71 10 | − | 71 50 | x | − | 71 50 | x | + | 71 250 | x | x |
| x | = | 71 10 | − | 71 25 | x | + | 71 250 | x | x |