| ( | 8 | + | 2900 | − | y | ÷ | 50 | ) | ( | y | − | 2500 | ) | = | 5000 |
| 方程左边 = | 8 | ( | y | − | 2500 | ) | + | 2900 | ( | y | − | 2500 | ) | − | y | ÷ | 50 | × | ( | y | − | 2500 | ) |
| = | 8 | y | − | 8 | × | 2500 | + | 2900 | ( | y | − | 2500 | ) | − | y | × | 1 50 | ( | y | − | 2500 | ) |
| = | 8 | y | − | 20000 | + | 2900 | ( | y | − | 2500 | ) | − | y | × | 1 50 | ( | y | − | 2500 | ) |
| = | 8 | y | − | 20000 | + | 2900 | y | − | 2900 | × | 2500 | − | y | × | 1 50 | ( | y | − | 2500 | ) |
| = | 8 | y | − | 20000 | + | 2900 | y | − | 7250000 | − | y | × | 1 50 | ( | y | − | 2500 | ) |
| = | 2908 | y | − | 7270000 | − | y | × | 1 50 | ( | y | − | 2500 | ) |
| = | 2908 | y | − | 7270000 | − | y | × | 1 50 | y | + | y | × | 1 50 | × | 2500 |
| = | 2908 | y | − | 7270000 | − | y | × | 1 50 | y | + | y | × | 50 |
| = | 2958 | y | − | 7270000 | − | y | × | 1 50 | y |
| 2958 | y | − | 7270000 | − | y | × | 1 50 | y | = | 5000 |