| ( | x | + | 50 | ) | ÷ | ( | x | + | 62 | ) | = | 4 5 |
| 方程两边同时乘以: | ( | x | + | 62 | ) |
| ( | x | + | 50 | ) | = | 4 5 | ( | x | + | 62 | ) |
| x | + | 50 | = | 4 5 | ( | x | + | 62 | ) |
| x | + | 50 | = | 4 5 | x | + | 4 5 | × | 62 |
| x | + | 50 | = | 4 5 | x | + | 248 5 |
| x | − | 4 5 | x | = | 248 5 | − | 50 |
1 5 | x | = | 248 5 | − | 50 |
1 5 | x | = | - | 2 5 |
| x | = | - | 2 5 | ÷ | 1 5 |
| = | - | 2 5 | × | 5 |
| = | - | 2 | × | 1 |
| x | = | - | 2 |