| ( | 521 | − | x | ) | ÷ | 105 | = | ( | 347 | − | 2 | x | ) | ÷ | 74 |
| 方程左边 = | 521 | × | 1 105 | − | x | × | 1 105 |
| = | 521 105 | − | x | × | 1 105 |
521 105 | − | 1 105 | x | = | ( | 347 | − | 2 | x | ) | ÷ | 74 |
| 方程右边 = | 347 | × | 1 74 | − | 2 | x | × | 1 74 |
| = | 347 74 | − | 1 37 | x |
521 105 | − | 1 105 | x | = | 347 74 | − | 1 37 | x |
| - | 1 105 | x | + | 1 37 | x | = | 347 74 | − | 521 105 |
68 3885 | x | = | 347 74 | − | 521 105 |
68 3885 | x | = | - | 2119 7770 |
| x | = | - | 2119 7770 | ÷ | 68 3885 |
| = | - | 2119 7770 | × | 3885 68 |
| = | - | 2119 2 | × | 1 68 |
| x | = | - | 2119 136 |
| x | = | - 15.580882 |