| ( | 1200 | − | 1 | ÷ | 8 | × | x | + | 30 | ) | ÷ | ( | 1 | − | 1 | ÷ | 8 | × | x | ) | = | 2 |
| 方程两边同时乘以: | ( | 1 | − | 1 | ÷ | 8 | × | x | ) |
| ( | 1200 | − | 1 | ÷ | 8 | × | x | + | 30 | ) | = | 2 | ( | 1 | − | 1 | ÷ | 8 | × | x | ) |
| 1200 | − | 1 | ÷ | 8 | × | x | + | 30 | = | 2 | ( | 1 | − | 1 | ÷ | 8 | × | x | ) |
| 1200 | − | 1 | ÷ | 8 | × | x | + | 30 | = | 2 | × | 1 | − | 2 | × | 1 | ÷ | 8 | × | x |
| 1200 | − | 1 8 | x | + | 30 | = | 2 | − | 1 4 | x |
| 1230 | − | 1 8 | x | = | 2 | − | 1 4 | x |
| - | 1 8 | x | + | 1 4 | x | = | 2 | − | 1230 |
1 8 | x | = | 2 | − | 1230 |
1 8 | x | = | - | 1228 |
| x | = | - | 1228 | ÷ | 1 8 |
| = | - | 1228 | × | 8 |
| x | = | - | 9824 |