| ( | 25697 1000 | + | x | ) | × | 43 20 | = | 51393 1000 | + | 6989 100 | − | x |
| 方程左边 = | 25697 1000 | × | 43 20 | + | x | × | 43 20 |
| = | 1104971 20000 | + | x | × | 43 20 |
1104971 20000 | + | 43 20 | x | = | 51393 1000 | + | 6989 100 | − | x |
| 方程右边 = | 121283 1000 | − | x |
1104971 20000 | + | 43 20 | x | = | 121283 1000 | − | x |
43 20 | x | + | x | = | 121283 1000 | − | 1104971 20000 |
63 20 | x | = | 121283 1000 | − | 1104971 20000 |
63 20 | x | = | 1320689 20000 |
| x | = | 1320689 20000 | ÷ | 63 20 |
| = | 1320689 20000 | × | 20 63 |
| = | 1320689 1000 | × | 1 63 |
| x | = | 1320689 63000 |
| x | = | 20.963317 |