| X | + | 1 5 | X | + | 1 5 | ( | X | + | 1 5 | X | ) | + | 3 5 | X | = | 450000 |
| 方程左边 = | 9 5 | X | + | 1 5 | ( | X | + | 1 5 | X | ) |
9 5 | X | + | 1 5 | ( | X | + | 1 5 | X | ) | = | 450000 |
| 方程左边 = | 9 5 | X | + | 1 5 | X | + | 1 5 | × | 1 5 | X |
| = | 9 5 | X | + | 1 5 | X | + | 1 25 | X |
| = | 51 25 | X |
51 25 | X | = | 450000 |
| X | = | 450000 | ÷ | 51 25 |
| = | 450000 | × | 25 51 |
| = | 150000 | × | 25 17 |
| X | = | 3750000 17 |
| X | = | 220588.235294 |