| 20 | − | x | − | 23 10 | − | ( | 20 | − | x | − | 23 10 | ) | × | 4 25 | = | 17 2 |
| 方程左边 = | 177 10 | − | x | − | ( | 20 | − | x | − | 23 10 | ) | × | 4 25 |
177 10 | − | x | − | ( | 20 | − | x | − | 23 10 | ) | × | 4 25 | = | 17 2 |
| 方程左边 = | 177 10 | − | x | − | 20 | × | 4 25 | + | x | × | 4 25 | + | 23 10 | × | 4 25 |
| = | 177 10 | − | x | − | 16 5 | + | x | × | 4 25 | + | 46 125 |
| = | 3717 250 | − | 21 25 | x |
3717 250 | − | 21 25 | x | = | 17 2 |
| - | 21 25 | x | = | 17 2 | − | 3717 250 |
| - | 21 25 | x | = | - | 796 125 |
796 125 | = | 21 25 | x |
21 25 | x | = | 796 125 |
| x | = | 796 125 | ÷ | 21 25 |
| = | 796 125 | × | 25 21 |
| = | 796 5 | × | 1 21 |
| x | = | 796 105 |
| x | = | 7.580952 |