| X | ÷ | 135 | − | 5 | ÷ | 130 | − | 15 | ÷ | 1650 | − | 1 100 | = | 19 12500 | ( | 30 | + | X | ) |
| 方程左边 = | X | × | 1 135 | − | 1 26 | − | 1 110 | − | 1 100 |
| = | 1 135 | X | − | 823 14300 |
1 135 | X | − | 823 14300 | = | 19 12500 | ( | 30 | + | X | ) |
| 方程右边 = | 19 12500 | × | 30 | + | 19 12500 | X |
| = | 57 1250 | + | 19 12500 | X |
1 135 | X | − | 823 14300 | = | 57 1250 | + | 19 12500 | X |
1 135 | X | − | 19 12500 | X | = | 57 1250 | + | 823 14300 |
1987 337500 | X | = | 57 1250 | + | 823 14300 |
1987 337500 | X | = | 36877 357500 |
| X | = | 36877 357500 | ÷ | 1987 337500 |
| = | 36877 357500 | × | 337500 1987 |
| = | 36877 143 | × | 135 1987 |
| X | = | 4978395 284141 |
| X | = | 17.520861 |