| ( | 12812 | × | 199 5000 | − | X | ) | ÷ | ( | 12812 | + | ( | 12812 | × | 199 500 | ) | − | X | ) | = | 1 10 |
| 方程两边同时乘以: | ( | 12812 | + | ( | 12812 | × | 199 500 | ) | − | X | ) |
| ( | 12812 | × | 199 5000 | − | X | ) | = | 1 10 | ( | 12812 | + | ( | 12812 | × | 199 500 | ) | − | X | ) |
| 12812 | × | 199 5000 | − | X | = | 1 10 | ( | 12812 | + | ( | 12812 | × | 199 500 | ) | − | X | ) |
| 12812 | × | 199 5000 | − | X | = | 1 10 | × | 12812 | + | 1 10 | ( | 12812 | × | 199 500 | ) | − | 1 10 | X |
637397 1250 | − | X | = | 6406 5 | + | 1 10 | ( | 12812 | × | 199 500 | ) | − | 1 10 | X |
637397 1250 | − | X | = | 6406 5 | + | 1 10 | × | 12812 | × | 199 500 | − | 1 10 | X |
637397 1250 | − | X | = | 6406 5 | + | 637397 1250 | − | 1 10 | X |
637397 1250 | − | X | = | 2238897 1250 | − | 1 10 | X |
| - | X | + | 1 10 | X | = | 2238897 1250 | − | 637397 1250 |
| - | 9 10 | X | = | 2238897 1250 | − | 637397 1250 |
| - | 9 10 | X | = | 6406 5 |
| - | 6406 5 | = | 9 10 | X |
9 10 | X | = | - | 6406 5 |
| X | = | - | 6406 5 | ÷ | 9 10 |
| = | - | 6406 5 | × | 10 9 |
| = | - | 6406 | × | 2 9 |
| X | = | - | 12812 9 |
| X | = | - 1423.555556 |