| ( | 1 | − | ( | 7 10 | x | ÷ | 7 10 | × | x | + | 100 | ) | ) | × | 12 5 | = | ( | 1 | − | ( | 133 250 | x | ÷ | 133 250 | × | x | + | 100 | ) | ) | × | 83 40 |
| 方程左边 = | 1 | × | 12 5 | − | ( | 7 10 | x | ÷ | 7 10 | × | x | + | 100 | ) | × | 12 5 |
| = | 12 5 | − | ( | 7 10 | x | ÷ | 7 10 | × | x | + | 100 | ) | × | 12 5 |
| = | 12 5 | − | 7 10 | x | ÷ | 7 10 | × | x | × | 12 5 | − | 100 | × | 12 5 |
| = | 12 5 | − | 12 5 | x | x | − | 240 |
| = | - | 1188 5 | − | 12 5 | x | x |
| - | 1188 5 | − | 12 5 | x | x | = | ( | 1 | − | ( | 133 250 | x | ÷ | 133 250 | × | x | + | 100 | ) | ) | × | 83 40 |
| 方程右边 = | 1 | × | 83 40 | − | ( | 133 250 | x | ÷ | 133 250 | × | x | + | 100 | ) | × | 83 40 |
| = | 83 40 | − | ( | 133 250 | x | ÷ | 133 250 | × | x | + | 100 | ) | × | 83 40 |
| = | 83 40 | − | 133 250 | x | ÷ | 133 250 | × | x | × | 83 40 | − | 100 | × | 83 40 |
| = | 83 40 | − | 83 40 | x | x | − | 415 2 |
| = | - | 8217 40 | − | 83 40 | x | x |
| - | 1188 5 | − | 12 5 | x | x | = | - | 8217 40 | − | 83 40 | x | x |