| 150 | + | 1 | ÷ | 5 | × | x | + | 1 | ÷ | 4 | × | ( | 150 | + | 1 | ÷ | 5 | × | x | ) | = | x |
| 方程左边 = | 150 | + | 1 5 | x | + | 1 4 | ( | 150 | + | 1 | ÷ | 5 | × | x | ) |
| 150 | + | 1 5 | x | + | 1 4 | ( | 150 | + | 1 | ÷ | 5 | × | x | ) | = | x |
| 方程左边 = | 150 | + | 1 5 | x | + | 1 4 | × | 150 | + | 1 4 | × | 1 | ÷ | 5 | × | x |
| = | 150 | + | 1 5 | x | + | 75 2 | + | 1 20 | x |
| = | 375 2 | + | 1 4 | x |
375 2 | + | 1 4 | x | = | x |
1 4 | x | − | x | = | - | 375 2 |
| - | 3 4 | x | = | - | 375 2 |
375 2 | = | 3 4 | x |
3 4 | x | = | 375 2 |
| x | = | 375 2 | ÷ | 3 4 |
| = | 375 2 | × | 4 3 |
| = | 125 | × | 2 |
| x | = | 250 |