| ( | X | − | 200 | ) | × | 1 | − | 25 100 | ÷ | 3000 | + | 300 | = | ( | X | − | 200 | − | 150 | ) | × | 1 | − | 25 100 | ÷ | 3000 |
| 方程左边 = | ( | X | − | 200 | ) | × | 1 | − | 1 12000 | + | 300 |
| = | ( | X | − | 200 | ) | × | 1 | + | 3599999 12000 |
| ( | X | − | 200 | ) | × | 1 | + | 3599999 12000 | = | ( | X | − | 200 | − | 150 | ) | × | 1 | − | 25 100 | ÷ | 3000 |
| 方程左边 = | X | × | 1 | − | 200 | × | 1 | + | 3599999 12000 |
| = | X | × | 1 | − | 200 | + | 3599999 12000 |
| = | 1 | X | + | 1199999 12000 |
| 1 | X | + | 1199999 12000 | = | ( | X | − | 200 | − | 150 | ) | × | 1 | − | 25 100 | ÷ | 3000 |
| 方程右边 = | ( | X | − | 200 | − | 150 | ) | × | 1 | − | 1 12000 |
| 1 | X | + | 1199999 12000 | = | ( | X | − | 200 | − | 150 | ) | × | 1 | − | 1 12000 |
| 方程右边 = | X | × | 1 | − | 200 | × | 1 | − | 150 | × | 1 | − | 1 12000 |
| = | X | × | 1 | − | 200 | − | 150 | − | 1 12000 |
| = | 1 | X | − | 4200001 12000 |
| 1 | X | + | 1199999 12000 | = | 1 | X | − | 4200001 12000 |
| 1 | X | − | 1 | X | = | - | 4200001 12000 | − | 1199999 12000 |
| 0 | X | = | - | 4200001 12000 | − | 1199999 12000 |
| 0 | X | = | - | 450 |