| 900 | ÷ | x | + | 200 | = | 900 | ÷ | ( | 1 | − | 1 | ÷ | 4 | ) | × | x |
| 方程两边同时乘以: | x | , | ( | 1 | − | 1 | ÷ | 4 | ) |
| 900 | ( | 1 | − | 1 | ÷ | 4 | ) | + | 200 | x | ( | 1 | − | 1 | ÷ | 4 | ) | = | 900 | x | x |
| 900 | × | 1 | − | 900 | × | 1 | ÷ | 4 | + | 200 | x | ( | 1 | − | 1 | ÷ | 4 | ) | = | 900 | x | x |
| 900 | − | 225 | + | 200 | x | ( | 1 | − | 1 | ÷ | 4 | ) | = | 900 | x | x |
| 675 | + | 200 | x | ( | 1 | − | 1 | ÷ | 4 | ) | = | 900 | x | x |
| 675 | + | 200 | x | × | 1 | − | 200 | x | × | 1 | ÷ | 4 | = | 900 | x | x |
| 675 | + | 200 | x | − | 50 | x | = | 900 | x | x |
| 675 | + | 150 | x | = | 900 | x | x |