| ( | 150 | − | 140 | ) | ÷ | ( | 111 100 | − | x | ) | = | ( | 140 | − | 100 | ) | ÷ | ( | x | − | 123 100 | ) |
| 方程两边同时乘以: | ( | 111 100 | − | x | ) | , | ( | x | − | 123 100 | ) |
| ( | 150 | − | 140 | ) | ( | x | − | 123 100 | ) | = | ( | 140 | − | 100 | ) | ( | 111 100 | − | x | ) |
| 150 | ( | x | − | 123 100 | ) | − | 140 | ( | x | − | 123 100 | ) | = | ( | 140 | − | 100 | ) | ( | 111 100 | − | x | ) |
| 150 | ( | x | − | 123 100 | ) | − | 140 | ( | x | − | 123 100 | ) | = | 140 | ( | 111 100 | − | x | ) | − | 100 | ( | 111 100 | − | x | ) |
| 150 | x | − | 150 | × | 123 100 | − | 140 | ( | x | − | 123 100 | ) | = | 140 | ( | 111 100 | − | x | ) | − | 100 | ( | 111 100 | − | x | ) |
| 150 | x | − | 150 | × | 123 100 | − | 140 | ( | x | − | 123 100 | ) | = | 140 | × | 111 100 | − | 140 | x | − | 100 | ( | 111 100 | − | x | ) |
| 150 | x | − | 369 2 | − | 140 | ( | x | − | 123 100 | ) | = | 777 5 | − | 140 | x | − | 100 | ( | 111 100 | − | x | ) |
| 150 | x | − | 369 2 | − | 140 | x | + | 140 | × | 123 100 | = | 777 5 | − | 140 | x | − | 100 | ( | 111 100 | − | x | ) |
| 150 | x | − | 369 2 | − | 140 | x | + | 140 | × | 123 100 | = | 777 5 | − | 140 | x | − | 100 | × | 111 100 | + | 100 | x |
| 150 | x | − | 369 2 | − | 140 | x | + | 861 5 | = | 777 5 | − | 140 | x | − | 111 | + | 100 | x |
| 10 | x | − | 123 10 | = | 222 5 | − | 40 | x |
| 10 | x | + | 40 | x | = | 222 5 | + | 123 10 |
| 50 | x | = | 222 5 | + | 123 10 |
| 50 | x | = | 567 10 |
| x | = | 567 10 | ÷ | 50 |
| = | 567 10 | × | 1 50 |
| x | = | 567 500 |
| x | = | 1.134 |