| ( | ( | 3986947 100 | − | X | ) | ÷ | 3986947 100 | ) | × | 100 100 | = | 9 100 |
| 方程左边 = | ( | 3986947 100 | − | X | ) | ÷ | 3986947 100 | × | 100 100 |
| = | ( | 3986947 100 | − | X | ) | × | 100 3986947 |
| = | 3986947 100 | × | 100 3986947 | − | X | × | 100 3986947 |
| = | 2887 2887 | − | X | × | 100 3986947 |
2887 2887 | − | 100 3986947 | X | = | 9 100 |
| - | 100 3986947 | X | = | 9 100 | − | 2887 2887 |
| - | 100 3986947 | X | = | - | 262717 288700 |
262717 288700 | = | 100 3986947 | X |
100 3986947 | X | = | 262717 288700 |
| X | = | 262717 288700 | ÷ | 100 3986947 |
| = | 262717 288700 | × | 3986947 100 |
| X | = | 1047438754999 28870000 |