| ( | 1090 | − | x | ) | × | 2 | × | 13 10 | = | 847 |
| 方程左边 = | ( | 1090 | − | x | ) | × | 13 5 |
| ( | 1090 | − | x | ) | × | 13 5 | = | 847 |
| 方程左边 = | 1090 | × | 13 5 | − | x | × | 13 5 |
| = | 2834 | − | x | × | 13 5 |
| 2834 | − | 13 5 | x | = | 847 |
| - | 13 5 | x | = | 847 | − | 2834 |
| - | 13 5 | x | = | - | 1987 |
| 1987 | = | 13 5 | x |
13 5 | x | = | 1987 |
| x | = | 1987 | ÷ | 13 5 |
| = | 1987 | × | 5 13 |
| x | = | 9935 13 |
| x | = | 764.230769 |