103 100 | x | + | 45 | + | 30 | + | 10 | + | ( | 103 100 | x | + | 45 | + | 30 | + | 10 | ) | × | 3 20 | = | 210 |
| 方程左边 = | 103 100 | x | + | 85 | + | ( | 103 100 | x | + | 45 | + | 30 | + | 10 | ) | × | 3 20 |
103 100 | x | + | 85 | + | ( | 103 100 | x | + | 45 | + | 30 | + | 10 | ) | × | 3 20 | = | 210 |
| 方程左边 = | 103 100 | x | + | 85 | + | 103 100 | x | × | 3 20 | + | 45 | × | 3 20 | + | 30 | × | 3 20 | + | 10 | × | 3 20 |
| = | 103 100 | x | + | 85 | + | 309 2000 | x | + | 27 4 | + | 9 2 | + | 3 2 |
| = | 2369 2000 | x | + | 391 4 |
2369 2000 | x | + | 391 4 | = | 210 |
2369 2000 | x | = | 210 | − | 391 4 |
2369 2000 | x | = | 449 4 |
| x | = | 449 4 | ÷ | 2369 2000 |
| = | 449 4 | × | 2000 2369 |
| = | 449 | × | 500 2369 |
| x | = | 224500 2369 |
| x | = | 94.765724 |