48 25 | × | 220 | + | ( | X | − | 220 | ) | × | 33 10 | + | 17 10 | × | 7 10 | X | = | 2001 2 |
| 方程左边 = | 2112 5 | + | ( | X | − | 220 | ) | × | 33 10 | + | 119 100 | X |
2112 5 | + | ( | X | − | 220 | ) | × | 33 10 | + | 119 100 | X | = | 2001 2 |
| 方程左边 = | 2112 5 | + | X | × | 33 10 | − | 220 | × | 33 10 | + | 119 100 | X |
| = | 2112 5 | + | X | × | 33 10 | − | 726 | + | 119 100 | X |
| = | - | 1518 5 | + | 449 100 | X |
| - | 1518 5 | + | 449 100 | X | = | 2001 2 |
449 100 | X | = | 2001 2 | + | 1518 5 |
449 100 | X | = | 13041 10 |
| X | = | 13041 10 | ÷ | 449 100 |
| = | 13041 10 | × | 100 449 |
| = | 13041 | × | 10 449 |
| X | = | 130410 449 |
| X | = | 290.445434 |