| ( | 25 | + | x | ) | × | 6 25 | = | ( | x | + | 10 | ) | × | 9 20 |
| 方程左边 = | 25 | × | 6 25 | + | x | × | 6 25 |
| = | 6 | + | x | × | 6 25 |
| 6 | + | 6 25 | x | = | ( | x | + | 10 | ) | × | 9 20 |
| 方程右边 = | x | × | 9 20 | + | 10 | × | 9 20 |
| = | x | × | 9 20 | + | 9 2 |
| 6 | + | 6 25 | x | = | 9 20 | x | + | 9 2 |
6 25 | x | − | 9 20 | x | = | 9 2 | − | 6 |
| - | 21 100 | x | = | 9 2 | − | 6 |
| - | 21 100 | x | = | - | 3 2 |
3 2 | = | 21 100 | x |
21 100 | x | = | 3 2 |
| x | = | 3 2 | ÷ | 21 100 |
| = | 3 2 | × | 100 21 |
| = | 1 | × | 50 7 |
| x | = | 50 7 |
| x | = | 7.142857 |