103 100 | x | + | 86 | + | 30 | + | 20 | + | ( | 103 100 | x | + | 86 | + | 30 | + | 20 | ) | × | 3 20 | = | 700 |
| 方程左边 = | 103 100 | x | + | 136 | + | ( | 103 100 | x | + | 86 | + | 30 | + | 20 | ) | × | 3 20 |
103 100 | x | + | 136 | + | ( | 103 100 | x | + | 86 | + | 30 | + | 20 | ) | × | 3 20 | = | 700 |
| 方程左边 = | 103 100 | x | + | 136 | + | 103 100 | x | × | 3 20 | + | 86 | × | 3 20 | + | 30 | × | 3 20 | + | 20 | × | 3 20 |
| = | 103 100 | x | + | 136 | + | 309 2000 | x | + | 129 10 | + | 9 2 | + | 3 |
| = | 2369 2000 | x | + | 782 5 |
2369 2000 | x | + | 782 5 | = | 700 |
2369 2000 | x | = | 700 | − | 782 5 |
2369 2000 | x | = | 2718 5 |
| x | = | 2718 5 | ÷ | 2369 2000 |
| = | 2718 5 | × | 2000 2369 |
| = | 2718 | × | 400 2369 |
| x | = | 1087200 2369 |
| x | = | 458.927818 |