| 4 | ÷ | 5 | × | x | − | 10 | + | 50 | = | ( | x | − | 10 | ) | × | 3 | ÷ | 4 |
| 方程左边 = | 4 5 | x | − | 10 | + | 50 |
| = | 4 5 | x | + | 40 |
4 5 | x | + | 40 | = | ( | x | − | 10 | ) | × | 3 | ÷ | 4 |
| 方程右边 = | ( | x | − | 10 | ) | × | 3 4 |
4 5 | x | + | 40 | = | ( | x | − | 10 | ) | × | 3 4 |
| 方程右边 = | x | × | 3 4 | − | 10 | × | 3 4 |
| = | x | × | 3 4 | − | 15 2 |
4 5 | x | + | 40 | = | 3 4 | x | − | 15 2 |
4 5 | x | − | 3 4 | x | = | - | 15 2 | − | 40 |
1 20 | x | = | - | 15 2 | − | 40 |
1 20 | x | = | - | 95 2 |
| x | = | - | 95 2 | ÷ | 1 20 |
| = | - | 95 2 | × | 20 |
| = | - | 95 | × | 10 |
| x | = | - | 950 |