| X | + | X | ( | 1 | + | 1 10 | ) | + | X | ( | 1 | + | 1 5 | ) | + | X | ( | 1 | + | 3 10 | ) | = | 1 |
| 方程左边 = | X | + | X | × | 1 | + | X | × | 1 10 | + | X | ( | 1 | + | 1 5 | ) | + | X | ( | 1 | + | 3 10 | ) |
| = | 21 10 | X | + | X | ( | 1 | + | 1 5 | ) | + | X | ( | 1 | + | 3 10 | ) |
| = | 21 10 | X | + | X | × | 1 | + | X | × | 1 5 | + | X | ( | 1 | + | 3 10 | ) |
| = | 33 10 | X | + | X | ( | 1 | + | 3 10 | ) |
| = | 33 10 | X | + | X | × | 1 | + | X | × | 3 10 |
| = | 23 5 | X |
23 5 | X | = | 1 |
| X | = | 1 | ÷ | 23 5 |
| = | 1 | × | 5 23 |
| X | = | 5 23 |
| X | = | 0.217391 |