| ( | 1 25 | x | + | 9 100 | ) | ÷ | 1 20 | − | ( | 3 10 | x | + | 1 5 | ) | ÷ | 3 10 | = | ( | x | − | 5 | ) | ÷ | 2 |
| 方程左边 = | 1 25 | x | × | 20 | + | 9 100 | × | 20 | − | ( | 3 10 | x | + | 1 5 | ) | × | 10 3 |
| = | 4 5 | x | + | 9 5 | − | ( | 3 10 | x | + | 1 5 | ) | × | 10 3 |
| = | 4 5 | x | + | 9 5 | − | 3 10 | x | × | 10 3 | − | 1 5 | × | 10 3 |
| = | 4 5 | x | + | 9 5 | − | 1 | x | − | 2 3 |
| = | - | 1 5 | x | + | 17 15 |
| - | 1 5 | x | + | 17 15 | = | ( | x | − | 5 | ) | ÷ | 2 |
| 方程右边 = | x | × | 1 2 | − | 5 | × | 1 2 |
| = | x | × | 1 2 | − | 5 2 |
| - | 1 5 | x | + | 17 15 | = | 1 2 | x | − | 5 2 |
| - | 1 5 | x | − | 1 2 | x | = | - | 5 2 | − | 17 15 |
| - | 7 10 | x | = | - | 5 2 | − | 17 15 |
| - | 7 10 | x | = | - | 109 30 |
109 30 | = | 7 10 | x |
7 10 | x | = | 109 30 |
| x | = | 109 30 | ÷ | 7 10 |
| = | 109 30 | × | 10 7 |
| = | 109 3 | × | 1 7 |
| x | = | 109 21 |
| x | = | 5.190476 |