| ( | 1200 | a | − | 1900 | a | + | 66500 | ) | ÷ | a | × | ( | a | − | 35 | ) | = | 0 |
| 方程两边同时乘以: | a |
| ( | 1200 | a | − | 1900 | a | + | 66500 | ) | ( | a | − | 35 | ) | = | 0 |
| 1200 | a | ( | a | − | 35 | ) | − | 1900 | a | ( | a | − | 35 | ) | + | 66500 | ( | a | − | 35 | ) | = | 0 |
| 1200 | a | a | − | 1200 | a | × | 35 | − | 1900 | a | ( | a | − | 35 | ) | + | 66500 | ( | a | − | 35 | ) | = | 0 |
| 1200 | a | a | − | 42000 | a | − | 1900 | a | ( | a | − | 35 | ) | + | 66500 | ( | a | − | 35 | ) | = | 0 |
| 1200 | a | a | − | 42000 | a | − | 1900 | a | a | + | 1900 | a | × | 35 | + | 66500 | = | 0 |
| 1200 | a | a | − | 42000 | a | − | 1900 | a | a | + | 66500 | a | + | 66500 | ( | a | − | 35 | ) | = | 0 |
| 1200 | a | a | + | 24500 | a | − | 1900 | a | a | + | 66500 | ( | a | − | 35 | ) | = | 0 |
| 1200 | a | a | + | 24500 | a | − | 1900 | a | a | + | 66500 | a | − | 66500 | × | 35 | = | 0 |
| 1200 | a | a | + | 24500 | a | − | 1900 | a | a | + | 66500 | a | − | 2327500 | = | 0 |
| 1200 | a | a | + | 91000 | a | − | 1900 | a | a | − | 2327500 | = | 0 |