| ( | X | − | 6801769 100 | ) | ÷ | ( | X | ÷ | 13 100 | ) | = | 1 250 |
| 方程两边同时乘以: | ( | X | ÷ | 13 100 | ) |
| ( | X | − | 6801769 100 | ) | = | 1 250 | ( | X | ÷ | 13 100 | ) |
| X | − | 6801769 100 | = | 1 250 | ( | X | ÷ | 13 100 | ) |
| X | − | 6801769 100 | = | 1 250 | X | ÷ | 13 100 |
| X | − | 6801769 100 | = | 2 65 | X |
| X | − | 2 65 | X | = | 6801769 100 |
63 65 | X | = | 6801769 100 |
| X | = | 6801769 100 | ÷ | 63 65 |
| = | 6801769 100 | × | 65 63 |
| = | 6801769 20 | × | 13 63 |
| X | = | 88422997 1260 |
| X | = | 70176.981746 |