| 2 | ÷ | 5 | × | x | = | ( | 300 | − | x | ) | × | 1 | ÷ | 4 | + | 29 |
| 方程左边 = | 2 5 | x |
2 5 | x | = | ( | 300 | − | x | ) | × | 1 | ÷ | 4 | + | 29 |
| 方程右边 = | ( | 300 | − | x | ) | × | 1 4 | + | 29 |
2 5 | x | = | ( | 300 | − | x | ) | × | 1 4 | + | 29 |
| 方程右边 = | 300 | × | 1 4 | − | x | × | 1 4 | + | 29 |
| = | 75 | − | x | × | 1 4 | + | 29 |
| = | 104 | − | 1 4 | x |
2 5 | x | = | 104 | − | 1 4 | x |
2 5 | x | + | 1 4 | x | = | 104 |
13 20 | x | = | 104 |
| x | = | 104 | ÷ | 13 20 |
| = | 104 | × | 20 13 |
| = | 8 | × | 20 |
| x | = | 160 |