20 100 | = | x | × | 3200 | ÷ | 3152 | × | 3152 | ÷ | 2352 | × | 7 10 | ÷ | ( | 1 | − | x | × | 3200 | ÷ | 3152 | × | 3152 | ÷ | 2352 | × | 7 10 | ) |
| 方程两边同时乘以: | ( | 1 | − | x | × | 3200 | ÷ | 3152 | × | 3152 | ÷ | 2352 | × | 7 10 | ) |
20 100 | ( | 1 | − | x | × | 3200 | ÷ | 3152 | × | 3152 | ÷ | 2352 | × | 7 10 | ) | = | x | × | 3200 | ÷ | 3152 | × | 3152 | ÷ | 2352 | × | 7 10 |
20 100 | × | 1 | − | 20 100 | x | × | 3200 | ÷ | 3152 | × | 3152 | ÷ | 2352 | × | 7 10 | = | x | × | 3200 | ÷ | 3152 | × | 3152 | ÷ | 2352 | × | 7 10 |
1 5 | − | 4 21 | x | = | x | × | 20 21 |
| - | 4 21 | x | − | 20 21 | x | = | - | 1 5 |
| - | 8 7 | x | = | - | 1 5 |
1 5 | = | 8 7 | x |
8 7 | x | = | 1 5 |
| x | = | 1 5 | ÷ | 8 7 |
| = | 1 5 | × | 7 8 |
| x | = | 7 40 |
| x | = | 0.175 |