| 108 | × | 1 20 | + | 8 | × | 1 20 | ÷ | ( | - | 1 10 | ) | × | ( | x | − | 1 5 | ) | = | 287 50 |
| 方程两边同时乘以: | ( | - | 1 10 | ) |
| 108 | × | 1 20 | ( | - | 1 10 | ) | + | 8 | × | 1 20 | ( | x | − | 1 5 | ) | = | 287 50 | ( | - | 1 10 | ) |
| - | 108 | × | 1 20 | × | 1 10 | + | 8 | × | 1 20 | ( | x | − | 1 5 | ) | = | 287 50 | ( | - | 1 10 | ) |
| - | 108 | × | 1 20 | × | 1 10 | + | 8 | × | 1 20 | ( | x | − | 1 5 | ) | = | - | 287 50 | × | 1 10 |
| - | 27 50 | + | 2 5 | ( | x | − | 1 5 | ) | = | - | 287 500 |
| - | 27 50 | + | 2 5 | x | − | 2 5 | × | 1 5 | = | - | 287 500 |
| - | 27 50 | + | 2 5 | x | − | 2 25 | = | - | 287 500 |
| - | 31 50 | + | 2 5 | x | = | - | 287 500 |
2 5 | x | = | - | 287 500 | + | 31 50 |
2 5 | x | = | 23 500 |
| x | = | 23 500 | ÷ | 2 5 |
| = | 23 500 | × | 5 2 |
| = | 23 100 | × | 1 2 |
| x | = | 23 200 |
| x | = | 0.115 |