| ( | 4120 | + | 92 | x | ) | ÷ | ( | 97 2 | + | x | ) | = | 89 |
| 方程两边同时乘以: | ( | 97 2 | + | x | ) |
| ( | 4120 | + | 92 | x | ) | = | 89 | ( | 97 2 | + | x | ) |
| 4120 | + | 92 | x | = | 89 | ( | 97 2 | + | x | ) |
| 4120 | + | 92 | x | = | 89 | × | 97 2 | + | 89 | x |
| 4120 | + | 92 | x | = | 8633 2 | + | 89 | x |
| 92 | x | − | 89 | x | = | 8633 2 | − | 4120 |
| 3 | x | = | 8633 2 | − | 4120 |
| 3 | x | = | 393 2 |
| x | = | 393 2 | ÷ | 3 |
| = | 393 2 | × | 1 3 |
| = | 131 2 | × | 1 |
| x | = | 131 2 |
| x | = | 65.5 |