| ( | 10 | − | 2 | x | ) | ( | 55 | − | x | ) | ( | 10 | − | 2 | x | ) | ÷ | ( | 4 | x | x | ) | = | 3 200000 |
| 方程两边同时乘以: | ( | 4 | x | x | ) |
| ( | 10 | − | 2 | x | ) | ( | 55 | − | x | ) | ( | 10 | − | 2 | x | ) | = | 3 200000 | ( | 4 | x | x | ) |
| 10 | ( | 55 | − | x | ) | ( | 10 | − | 2 | x | ) | − | 2 | x | ( | 55 | − | x | ) | ( | 10 | − | 2 | x | ) | = | 3 200000 | ( | 4 | x | x | ) |
| 10 | ( | 55 | − | x | ) | ( | 10 | − | 2 | x | ) | − | 2 | x | ( | 55 | − | x | ) | ( | 10 | − | 2 | x | ) | = | 3 200000 | × | 4 | x | x |
| 10 | ( | 55 | − | x | ) | ( | 10 | − | 2 | x | ) | − | 2 | x | ( | 55 | − | x | ) | ( | 10 | − | 2 | x | ) | = | 3 50000 | x | x |
| 10 | × | 55 | ( | 10 | − | 2 | x | ) | − | 10 | x | ( | 10 | − | 2 | x | ) | − | 2 | x | ( | 55 | − | x | ) | ( | 10 | − | 2 | x | ) | = | 3 50000 | x | x |
| 550 | ( | 10 | − | 2 | x | ) | − | 10 | x | ( | 10 | − | 2 | x | ) | − | 2 | x | ( | 55 | − | x | ) | ( | 10 | − | 2 | x | ) | = | 3 50000 | x | x |
| 550 | × | 10 | − | 550 | × | 2 | x | − | 10 | x | ( | 10 | − | 2 | x | ) | − | 2 | x | ( | 55 | − | x | ) | ( | 10 | − | 2 | x | ) | = | 3 50000 | x | x |
| 5500 | − | 1100 | x | − | 10 | x | ( | 10 | − | 2 | x | ) | − | 2 | x | ( | 55 | − | x | ) | ( | 10 | − | 2 | x | ) | = | 3 50000 | x | x |
| 5500 | − | 1100 | x | − | 10 | x | × | 10 | + | 10 | x | × | 2 | x | − | 2 | x | = | 3 50000 | x | x |
| 5500 | − | 1100 | x | − | 100 | x | + | 20 | x | x | − | 2 | x | ( | 55 | − | x | ) | ( | 10 | − | 2 | x | ) | = | 3 50000 | x | x |
| 5500 | − | 1200 | x | + | 20 | x | x | − | 2 | x | ( | 55 | − | x | ) | ( | 10 | − | 2 | x | ) | = | 3 50000 | x | x |
| 5500 | − | 1200 | x | + | 20 | x | x | − | 2 | x | × | 55 | ( | 10 | − | 2 | x | ) | + | 2 | x | = | 3 50000 | x | x |
| 5500 | − | 1200 | x | + | 20 | x | x | − | 110 | x | ( | 10 | − | 2 | x | ) | + | 2 | x | x | = | 3 50000 | x | x |
| 5500 | − | 1200 | x | + | 20 | x | x | − | 110 | x | × | 10 | + | 110 | x | × | 2 | = | 3 50000 | x | x |
| 5500 | − | 1200 | x | + | 20 | x | x | − | 1100 | x | + | 220 | x | x | + | 2 | = | 3 50000 | x | x |
| 5500 | − | 2300 | x | + | 20 | x | x | + | 220 | x | x | + | 2 | x | x | = | 3 50000 | x | x |
| 5500 | − | 2300 | x | + | 20 | x | x | + | 220 | x | x | + | 2 | x | x | = | 3 50000 | x | x |
| 5500 | − | 2300 | x | + | 20 | x | x | + | 220 | x | x | + | 20 | x | x | = | 3 50000 | x | x |