| ( | 521 | − | x | ) | ÷ | 105 | = | ( | 347 | − | 2 | x | ) | ÷ | 153 |
| 方程左边 = | 521 | × | 1 105 | − | x | × | 1 105 |
| = | 521 105 | − | x | × | 1 105 |
521 105 | − | 1 105 | x | = | ( | 347 | − | 2 | x | ) | ÷ | 153 |
| 方程右边 = | 347 | × | 1 153 | − | 2 | x | × | 1 153 |
| = | 347 153 | − | 2 153 | x |
521 105 | − | 1 105 | x | = | 347 153 | − | 2 153 | x |
| - | 1 105 | x | + | 2 153 | x | = | 347 153 | − | 521 105 |
19 5355 | x | = | 347 153 | − | 521 105 |
19 5355 | x | = | - | 14426 5355 |
| x | = | - | 14426 5355 | ÷ | 19 5355 |
| = | - | 14426 5355 | × | 5355 19 |
| = | - | 14426 | × | 1 19 |
| x | = | - | 14426 19 |
| x | = | - 759.263158 |