| ( | 44240 | + | 553 100 | x | ) | ÷ | ( | 8000 | + | x | ) | = | 28 5 |
| 方程两边同时乘以: | ( | 8000 | + | x | ) |
| ( | 44240 | + | 553 100 | x | ) | = | 28 5 | ( | 8000 | + | x | ) |
| 44240 | + | 553 100 | x | = | 28 5 | ( | 8000 | + | x | ) |
| 44240 | + | 553 100 | x | = | 28 5 | × | 8000 | + | 28 5 | x |
| 44240 | + | 553 100 | x | = | 44800 | + | 28 5 | x |
553 100 | x | − | 28 5 | x | = | 44800 | − | 44240 |
| - | 7 100 | x | = | 44800 | − | 44240 |
| - | 7 100 | x | = | 560 |
| - | 560 | = | 7 100 | x |
7 100 | x | = | - | 560 |
| x | = | - | 560 | ÷ | 7 100 |
| = | - | 560 | × | 100 7 |
| = | - | 80 | × | 100 |
| x | = | - | 8000 |