| 5 | ( | 30 | + | x | + | 3 | × | 1 | + | 1 | × | 4 | ) | ÷ | ( | 35 | + | x | ) | = | 23 5 |
| 方程两边同时乘以: | ( | 35 | + | x | ) |
| 5 | ( | 30 | + | x | + | 3 | × | 1 | + | 1 | × | 4 | ) | = | 23 5 | ( | 35 | + | x | ) |
| 5 | × | 30 | + | 5 | x | + | 5 | × | 3 | × | 1 | + | 5 | × | 1 | × | 4 | = | 23 5 | ( | 35 | + | x | ) |
| 5 | × | 30 | + | 5 | x | + | 5 | × | 3 | × | 1 | + | 5 | × | 1 | × | 4 | = | 23 5 | × | 35 | + | 23 5 | x |
| 150 | + | 5 | x | + | 15 | + | 20 | = | 161 | + | 23 5 | x |
| 185 | + | 5 | x | = | 161 | + | 23 5 | x |
| 5 | x | − | 23 5 | x | = | 161 | − | 185 |
2 5 | x | = | 161 | − | 185 |
2 5 | x | = | - | 24 |
| x | = | - | 24 | ÷ | 2 5 |
| = | - | 24 | × | 5 2 |
| = | - | 12 | × | 5 |
| x | = | - | 60 |