| ( | 1 10 | − | X | ) | ÷ | ( | 1 10 | + | X | ) | = | 251 20000 |
| 方程两边同时乘以: | ( | 1 10 | + | X | ) |
| ( | 1 10 | − | X | ) | = | 251 20000 | ( | 1 10 | + | X | ) |
1 10 | − | X | = | 251 20000 | ( | 1 10 | + | X | ) |
1 10 | − | X | = | 251 20000 | × | 1 10 | + | 251 20000 | X |
1 10 | − | X | = | 251 200000 | + | 251 20000 | X |
| - | X | − | 251 20000 | X | = | 251 200000 | − | 1 10 |
| - | 20251 20000 | X | = | 251 200000 | − | 1 10 |
| - | 20251 20000 | X | = | - | 19749 200000 |
19749 200000 | = | 20251 20000 | X |
20251 20000 | X | = | 19749 200000 |
| X | = | 19749 200000 | ÷ | 20251 20000 |
| = | 19749 200000 | × | 20000 20251 |
| = | 19749 10 | × | 1 20251 |
| X | = | 19749 202510 |
| X | = | 0.097521 |