| ( | 6 | x | + | 180 | ) | ÷ | ( | 5 | x | − | 30 | ) | = | 18 | ÷ | 5 |
| 方程两边同时乘以: | ( | 5 | x | − | 30 | ) |
| ( | 6 | x | + | 180 | ) | = | 18 | ÷ | 5 | × | ( | 5 | x | − | 30 | ) |
| 6 | x | + | 180 | = | 18 | ÷ | 5 | × | ( | 5 | x | − | 30 | ) |
| 6 | x | + | 180 | = | 18 | ÷ | 5 | × | 5 | x | − | 18 | ÷ | 5 | × | 30 |
| 6 | x | + | 180 | = | 18 | x | − | 108 |
| 6 | x | − | 18 | x | = | - | 108 | − | 180 |
| - | 12 | x | = | - | 108 | − | 180 |
| - | 12 | x | = | - | 288 |
| 288 | = | 12 | x |
| 12 | x | = | 288 |
| x | = | 288 | ÷ | 12 |
| = | 288 | × | 1 12 |
| = | 24 | × | 1 |
| x | = | 24 |