| ( | 5000 | × | 12 | × | 9 10 | − | 70 100 | × | 80 | X | × | 159 2500 | ) | ÷ | ( | 30 100 | × | 80 | X | + | 5 100 | × | 80 | X | ) | = | 19 500 |
| 方程两边同时乘以: | ( | 30 100 | × | 80 | X | + | 5 100 | × | 80 | X | ) |
| ( | 5000 | × | 12 | × | 9 10 | − | 70 100 | × | 80 | X | × | 159 2500 | ) | = | 19 500 | ( | 30 100 | × | 80 | X | + | 5 100 | × | 80 | X | ) |
| 5000 | × | 12 | × | 9 10 | − | 70 100 | × | 80 | X | × | 159 2500 | = | 19 500 | ( | 30 100 | × | 80 | X | + | 5 100 | × | 80 | X | ) |
| 5000 | × | 12 | × | 9 10 | − | 70 100 | × | 80 | X | × | 159 2500 | = | 19 500 | × | 30 100 | × | 80 | X | + | 19 500 | × | 5 100 | × | 80 | X |
| 54000 | − | 2226 625 | X | = | 114 125 | X | + | 19 125 | X |
| 54000 | − | 2226 625 | X | = | 133 125 | X |
| - | 2226 625 | X | − | 133 125 | X | = | - | 54000 |
| - | 2891 625 | X | = | - | 54000 |
| 54000 | = | 2891 625 | X |
2891 625 | X | = | 54000 |
| X | = | 54000 | ÷ | 2891 625 |
| = | 54000 | × | 625 2891 |
| X | = | 33750000 2891 |
| X | = | 11674.16119 |