| ( | ( | X | − | 300 | ) | ( | 1 | − | 25 100 | ) | ) | ÷ | 900 | = | ( | ( | X | − | 160 | ) | ( | 1 | − | 25 100 | ) | ) | ÷ | 210 |
| 方程左边 = | ( | X | − | 300 | ) | ( | 1 | − | 25 100 | ) | × | 1 900 |
| = | X | ( | 1 | − | 25 100 | ) | × | 1 900 | − | 300 | ( | 1 | − | 25 100 | ) | × | 1 900 |
| = | X | ( | 1 | − | 25 100 | ) | × | 1 900 | − | 1 3 | ( | 1 | − | 25 100 | ) |
| = | X | × | 1 | × | 1 900 | − | X | × | 25 100 | × | 1 900 | − | 1 3 | ( | 1 | − | 25 100 | ) |
| = | X | × | 1 900 | − | X | × | 1 3600 | − | 1 3 | ( | 1 | − | 25 100 | ) |
| = | 1 1200 | X | − | 1 3 | ( | 1 | − | 25 100 | ) |
| = | 1 1200 | X | − | 1 3 | × | 1 | + | 1 3 | × | 25 100 |
| = | 1 1200 | X | − | 1 3 | + | 1 12 |
| = | 1 1200 | X | − | 1 4 |
1 1200 | X | − | 1 4 | = | ( | ( | X | − | 160 | ) | ( | 1 | − | 25 100 | ) | ) | ÷ | 210 |
| 方程右边 = | ( | X | − | 160 | ) | ( | 1 | − | 25 100 | ) | × | 1 210 |
| = | X | ( | 1 | − | 25 100 | ) | × | 1 210 | − | 160 | ( | 1 | − | 25 100 | ) | × | 1 210 |
| = | X | ( | 1 | − | 25 100 | ) | × | 1 210 | − | 16 21 | ( | 1 | − | 25 100 | ) |
| = | X | × | 1 | × | 1 210 | − | X | × | 25 100 | × | 1 210 | − | 16 21 | ( | 1 | − | 25 100 | ) |
| = | X | × | 1 210 | − | X | × | 1 840 | − | 16 21 | ( | 1 | − | 25 100 | ) |
| = | 1 280 | X | − | 16 21 | ( | 1 | − | 25 100 | ) |
| = | 1 280 | X | − | 16 21 | × | 1 | + | 16 21 | × | 25 100 |
| = | 1 280 | X | − | 16 21 | + | 4 21 |
| = | 1 280 | X | − | 4 7 |
1 1200 | X | − | 1 4 | = | 1 280 | X | − | 4 7 |
1 1200 | X | − | 1 280 | X | = | - | 4 7 | + | 1 4 |
| - | 23 8400 | X | = | - | 4 7 | + | 1 4 |
| - | 23 8400 | X | = | - | 9 28 |
9 28 | = | 23 8400 | X |
23 8400 | X | = | 9 28 |
| X | = | 9 28 | ÷ | 23 8400 |
| = | 9 28 | × | 8400 23 |
| = | 9 | × | 300 23 |
| X | = | 2700 23 |
| X | = | 117.391304 |