| ( | 25697 1000 | + | x | ) | × | 47 20 | = | 51393 1000 | + | 6989 100 | − | x |
| 方程左边 = | 25697 1000 | × | 47 20 | + | x | × | 47 20 |
| = | 1207759 20000 | + | x | × | 47 20 |
1207759 20000 | + | 47 20 | x | = | 51393 1000 | + | 6989 100 | − | x |
| 方程右边 = | 121283 1000 | − | x |
1207759 20000 | + | 47 20 | x | = | 121283 1000 | − | x |
47 20 | x | + | x | = | 121283 1000 | − | 1207759 20000 |
67 20 | x | = | 121283 1000 | − | 1207759 20000 |
67 20 | x | = | 1217901 20000 |
| x | = | 1217901 20000 | ÷ | 67 20 |
| = | 1217901 20000 | × | 20 67 |
| = | 1217901 1000 | × | 1 67 |
| x | = | 1217901 67000 |
| x | = | 18.177627 |