| ( | ( | X | − | 450 | ) | ( | 1 | − | 25 100 | ) | − | 100 | ) | ÷ | 100 | = | ( | ( | X | − | 200 | ) | ( | 1 | − | 25 100 | ) | − | 100 | ) | ÷ | 200 |
| 方程左边 = | ( | X | − | 450 | ) | ( | 1 | − | 25 100 | ) | × | 1 100 | − | 100 | × | 1 100 |
| = | ( | X | − | 450 | ) | ( | 1 | − | 25 100 | ) | × | 1 100 | − | 1 |
| = | X | ( | 1 | − | 25 100 | ) | × | 1 100 | − | 450 | ( | 1 | − | 25 100 | ) | × | 1 100 | − | 1 |
| = | X | ( | 1 | − | 25 100 | ) | × | 1 100 | − | 9 2 | ( | 1 | − | 25 100 | ) | − | 1 |
| = | X | × | 1 | × | 1 100 | − | X | × | 25 100 | × | 1 100 | − | 9 2 | ( | 1 | − | 25 100 | ) | − | 1 |
| = | X | × | 1 100 | − | X | × | 1 400 | − | 9 2 | ( | 1 | − | 25 100 | ) | − | 1 |
| = | 3 400 | X | − | 9 2 | ( | 1 | − | 25 100 | ) | − | 1 |
| = | 3 400 | X | − | 9 2 | × | 1 | + | 9 2 | × | 25 100 | − | 1 |
| = | 3 400 | X | − | 9 2 | + | 9 8 | − | 1 |
| = | 3 400 | X | − | 35 8 |
3 400 | X | − | 35 8 | = | ( | ( | X | − | 200 | ) | ( | 1 | − | 25 100 | ) | − | 100 | ) | ÷ | 200 |
| 方程右边 = | ( | X | − | 200 | ) | ( | 1 | − | 25 100 | ) | × | 1 200 | − | 100 | × | 1 200 |
| = | ( | X | − | 200 | ) | ( | 1 | − | 25 100 | ) | × | 1 200 | − | 1 2 |
| = | X | ( | 1 | − | 25 100 | ) | × | 1 200 | − | 200 | ( | 1 | − | 25 100 | ) | × | 1 200 | − | 1 2 |
| = | X | ( | 1 | − | 25 100 | ) | × | 1 200 | − | 1 | ( | 1 | − | 25 100 | ) | − | 1 2 |
| = | X | × | 1 | × | 1 200 | − | X | × | 25 100 | × | 1 200 | − | 1 | ( | 1 | − | 25 100 | ) | − | 1 2 |
| = | X | × | 1 200 | − | X | × | 1 800 | − | 1 | ( | 1 | − | 25 100 | ) | − | 1 2 |
| = | 3 800 | X | − | 1 | ( | 1 | − | 25 100 | ) | − | 1 2 |
| = | 3 800 | X | − | 1 | × | 1 | + | 1 | × | 25 100 | − | 1 2 |
| = | 3 800 | X | − | 1 | + | 1 4 | − | 1 2 |
| = | 3 800 | X | − | 5 4 |
3 400 | X | − | 35 8 | = | 3 800 | X | − | 5 4 |
3 400 | X | − | 3 800 | X | = | - | 5 4 | + | 35 8 |
3 800 | X | = | - | 5 4 | + | 35 8 |
3 800 | X | = | 25 8 |
| X | = | 25 8 | ÷ | 3 800 |
| = | 25 8 | × | 800 3 |
| = | 25 | × | 100 3 |
| X | = | 2500 3 |
| X | = | 833.333333 |