| ( | 12 100 | − | 10 100 | ) | ÷ | ( | 12 100 | − | x | ) | = | ( | - | 50 | − | 150 | ) | ÷ | ( | - | 50 | − | 0 | ) |
| 方程两边同时乘以: | ( | 12 100 | − | x | ) | , | ( | - | 50 | − | 0 | ) |
| ( | 12 100 | − | 10 100 | ) | ( | - | 50 | − | 0 | ) | = | ( | - | 50 | − | 150 | ) | ( | 12 100 | − | x | ) |
12 100 | ( | - | 50 | − | 0 | ) | − | 10 100 | ( | - | 50 | − | 0 | ) | = | ( | - | 50 | − | 150 | ) | ( | 12 100 | − | x | ) |
12 100 | ( | - | 50 | − | 0 | ) | − | 10 100 | ( | - | 50 | − | 0 | ) | = | - | 50 | ( | 12 100 | − | x | ) | − | 150 | ( | 12 100 | − | x | ) |
| - | 12 100 | × | 50 | − | 12 100 | × | 0 | − | 10 100 | ( | - | 50 | − | 0 | ) | = | - | 50 | ( | 12 100 | − | x | ) | − | 150 | ( | 12 100 | − | x | ) |
| - | 12 100 | × | 50 | − | 12 100 | × | 0 | − | 10 100 | ( | - | 50 | − | 0 | ) | = | - | 50 | × | 12 100 | + | 50 | x | − | 150 | ( | 12 100 | − | x | ) |
| - | 6 | − | 0 | − | 10 100 | ( | - | 50 | − | 0 | ) | = | - | 6 | + | 50 | x | − | 150 | ( | 12 100 | − | x | ) |
| - | 6 | − | 10 100 | ( | - | 50 | − | 0 | ) | = | - | 6 | + | 50 | x | − | 150 | ( | 12 100 | − | x | ) |
| - | 6 | + | 10 100 | × | 50 | + | 10 100 | × | 0 | = | - | 6 | + | 50 | x | − | 150 | ( | 12 100 | − | x | ) |
| - | 6 | + | 10 100 | × | 50 | + | 10 100 | × | 0 | = | - | 6 | + | 50 | x | − | 150 | × | 12 100 | + | 150 | x |
| - | 6 | + | 5 | + | 0 | = | - | 6 | + | 50 | x | − | 18 | + | 150 | x |
| - | 1 | = | - | 24 | + | 200 | x |
| - | 200 | x | = | - | 24 | + | 1 |
| - | 200 | x | = | - | 23 |
| 23 | = | 200 | x |
| 200 | x | = | 23 |
| x | = | 23 | ÷ | 200 |
| = | 23 | × | 1 200 |
| x | = | 23 200 |
| x | = | 0.115 |