| ( | 15 | − | x | ) | × | 26575539 400000 | = | x | × | 623110517 50000000 |
| 方程左边 = | 15 | × | 26575539 400000 | − | x | × | 26575539 400000 |
| = | 79726617 80000 | − | x | × | 26575539 400000 |
79726617 80000 | − | 26575539 400000 | x | = | x | × | 623110517 50000000 |
| - | 26575539 400000 | x | − | 623110517 50000000 | x | = | - | 79726617 80000 |