| x | − | 80 | x | ÷ | ( | x | + | 120 | ) | = | 24 100 | ( | x | + | 120 | ) |
| 方程两边同时乘以: | ( | x | + | 120 | ) |
| x | ( | x | + | 120 | ) | − | 80 | x | = | 24 100 | ( | x | + | 120 | ) | ( | x | + | 120 | ) |
| x | x | + | x | × | 120 | − | 80 | x | = | 24 100 | ( | x | + | 120 | ) | ( | x | + | 120 | ) |
| x | x | + | x | × | 120 | − | 80 | x | = | 24 100 | x | ( | x | + | 120 | ) | + | 24 100 | × | 120 | ( | x | + | 120 | ) |
| x | x | + | x | × | 120 | − | 80 | x | = | 24 100 | x | ( | x | + | 120 | ) | + | 144 5 | ( | x | + | 120 | ) |
| x | x | + | 40 | x | = | 24 100 | x | ( | x | + | 120 | ) | + | 144 5 | ( | x | + | 120 | ) |
| x | x | + | 40 | x | = | 24 100 | x | x | + | 24 100 | x | × | 120 | + | 144 5 | ( | x | + | 120 | ) |
| x | x | + | 40 | x | = | 24 100 | x | x | + | 144 5 | x | + | 144 5 | ( | x | + | 120 | ) |
| x | x | + | 40 | x | = | 24 100 | x | x | + | 144 5 | x | + | 144 5 | x | + | 144 5 | × | 120 |
| x | x | + | 40 | x | = | 24 100 | x | x | + | 144 5 | x | + | 144 5 | x | + | 3456 |
| x | x | + | 40 | x | = | 24 100 | x | x | + | 288 5 | x | + | 3456 |