| - | 79 10000 | x | × | 2 | + | 4201 2500 | x | + | 20991 1000 | = | 50 |
| 方程左边 = | - | 79 5000 | x | + | 4201 2500 | x | + | 20991 1000 |
| = | 8323 5000 | x | + | 20991 1000 |
8323 5000 | x | + | 20991 1000 | = | 50 |
8323 5000 | x | = | 50 | − | 20991 1000 |
8323 5000 | x | = | 29009 1000 |
| x | = | 29009 1000 | ÷ | 8323 5000 |
| = | 29009 1000 | × | 5000 8323 |
| = | 29009 | × | 5 8323 |
| x | = | 145045 8323 |
| x | = | 17.427009 |