| ( | 5 | ( | x | + | 530 | ) | ) | ÷ | ( | x | + | 530 | + | 1200 | ) | = | 2 5 |
| 方程两边同时乘以: | ( | x | + | 530 | + | 1200 | ) |
| ( | 5 | ( | x | + | 530 | ) | ) | = | 2 5 | ( | x | + | 530 | + | 1200 | ) |
| 5 | ( | x | + | 530 | ) | = | 2 5 | ( | x | + | 530 | + | 1200 | ) |
| 5 | ( | x | + | 530 | ) | = | 2 5 | x | + | 2 5 | × | 530 | + | 2 5 | × | 1200 |
| 5 | ( | x | + | 530 | ) | = | 2 5 | x | + | 212 | + | 480 |
| 5 | ( | x | + | 530 | ) | = | 2 5 | x | + | 692 |
| 5 | x | + | 5 | × | 530 | = | 2 5 | x | + | 692 |
| 5 | x | + | 2650 | = | 2 5 | x | + | 692 |
| 5 | x | − | 2 5 | x | = | 692 | − | 2650 |
23 5 | x | = | 692 | − | 2650 |
23 5 | x | = | - | 1958 |
| x | = | - | 1958 | ÷ | 23 5 |
| = | - | 1958 | × | 5 23 |
| x | = | - | 9790 23 |
| x | = | - 425.652174 |