| ( | x | − | x | × | 3 20 | − | x | × | 17 250 | − | 100 | − | 200 | ) | ÷ | x | = | 1 2 |
| 方程两边同时乘以: | x |
| ( | x | − | x | × | 3 20 | − | x | × | 17 250 | − | 100 | − | 200 | ) | = | 1 2 | x |
| x | − | x | × | 3 20 | − | x | × | 17 250 | − | 100 | − | 200 | = | 1 2 | x |
391 500 | x | − | 300 | = | 1 2 | x |
391 500 | x | − | 1 2 | x | = | 300 |
141 500 | x | = | 300 |
| x | = | 300 | ÷ | 141 500 |
| = | 300 | × | 500 141 |
| = | 100 | × | 500 47 |
| x | = | 50000 47 |
| x | = | 1063.829787 |