| ( | 2500 | × | 12 | × | 9 10 | − | 70 100 | × | 100 | X | × | 127 2000 | ) | ÷ | ( | 30 100 | × | 100 | X | + | 5 100 | × | 100 | X | ) | = | 19 500 |
| 方程两边同时乘以: | ( | 30 100 | × | 100 | X | + | 5 100 | × | 100 | X | ) |
| ( | 2500 | × | 12 | × | 9 10 | − | 70 100 | × | 100 | X | × | 127 2000 | ) | = | 19 500 | ( | 30 100 | × | 100 | X | + | 5 100 | × | 100 | X | ) |
| 2500 | × | 12 | × | 9 10 | − | 70 100 | × | 100 | X | × | 127 2000 | = | 19 500 | ( | 30 100 | × | 100 | X | + | 5 100 | × | 100 | X | ) |
| 2500 | × | 12 | × | 9 10 | − | 70 100 | × | 100 | X | × | 127 2000 | = | 19 500 | × | 30 100 | × | 100 | X | + | 19 500 | × | 5 100 | × | 100 | X |
| 27000 | − | 889 200 | X | = | 57 50 | X | + | 19 100 | X |
| 27000 | − | 889 200 | X | = | 133 100 | X |
| - | 889 200 | X | − | 133 100 | X | = | - | 27000 |
| - | 231 40 | X | = | - | 27000 |
| 27000 | = | 231 40 | X |
231 40 | X | = | 27000 |
| X | = | 27000 | ÷ | 231 40 |
| = | 27000 | × | 40 231 |
| = | 9000 | × | 40 77 |
| X | = | 360000 77 |
| X | = | 4675.324675 |