| ( | 4120 | + | 91 | x | ) | ÷ | ( | 97 2 | + | x | ) | = | 439 5 |
| 方程两边同时乘以: | ( | 97 2 | + | x | ) |
| ( | 4120 | + | 91 | x | ) | = | 439 5 | ( | 97 2 | + | x | ) |
| 4120 | + | 91 | x | = | 439 5 | ( | 97 2 | + | x | ) |
| 4120 | + | 91 | x | = | 439 5 | × | 97 2 | + | 439 5 | x |
| 4120 | + | 91 | x | = | 42583 10 | + | 439 5 | x |
| 91 | x | − | 439 5 | x | = | 42583 10 | − | 4120 |
16 5 | x | = | 42583 10 | − | 4120 |
16 5 | x | = | 1383 10 |
| x | = | 1383 10 | ÷ | 16 5 |
| = | 1383 10 | × | 5 16 |
| = | 1383 2 | × | 1 16 |
| x | = | 1383 32 |
| x | = | 43.21875 |