| ( | 300 | − | x | ) | ÷ | ( | - | 80 | − | x | ) | = | - | ( | 73 | ÷ | 23 | ) |
| 方程两边同时乘以: | ( | - | 80 | − | x | ) |
| ( | 300 | − | x | ) | = | - | ( | 73 | ÷ | 23 | ) | ( | - | 80 | − | x | ) |
| 300 | − | x | = | - | ( | 73 | ÷ | 23 | ) | ( | - | 80 | − | x | ) |
| 300 | − | x | = | - | 73 | ÷ | 23 | × | ( | - | 80 | − | x | ) |
| 300 | − | x | = | - | 73 23 | ( | - | 80 | − | x | ) |
| 300 | − | x | = | 73 23 | × | 80 | + | 73 23 | x |
| 300 | − | x | = | 5840 23 | + | 73 23 | x |
| - | x | − | 73 23 | x | = | 5840 23 | − | 300 |
| - | 96 23 | x | = | 5840 23 | − | 300 |
| - | 96 23 | x | = | - | 1060 23 |
1060 23 | = | 96 23 | x |
96 23 | x | = | 1060 23 |
| x | = | 1060 23 | ÷ | 96 23 |
| = | 1060 23 | × | 23 96 |
| = | 265 | × | 1 24 |
| x | = | 265 24 |
| x | = | 11.041667 |