| ( | 3472 125 | + | x | ) | × | 47 20 | = | 6944 125 | + | 9641 125 | − | x |
| 方程左边 = | 3472 125 | × | 47 20 | + | x | × | 47 20 |
| = | 40796 625 | + | x | × | 47 20 |
40796 625 | + | 47 20 | x | = | 6944 125 | + | 9641 125 | − | x |
| 方程右边 = | 3317 25 | − | x |
40796 625 | + | 47 20 | x | = | 3317 25 | − | x |
47 20 | x | + | x | = | 3317 25 | − | 40796 625 |
67 20 | x | = | 3317 25 | − | 40796 625 |
67 20 | x | = | 42129 625 |
| x | = | 42129 625 | ÷ | 67 20 |
| = | 42129 625 | × | 20 67 |
| = | 42129 125 | × | 4 67 |
| x | = | 168516 8375 |
| x | = | 20.121313 |