| ( | 30 | − | 30 | ÷ | 53 50 | ) | = | ( | 30 | − | X | ) | − | ( | 30 | − | X | ) | ÷ | 53 50 | + | X | − | X | ÷ | 101 100 | + | 30 | × | 80 100 | − | X |
| 方程左边 = | 30 | − | 30 | ÷ | 53 50 |
| = | 30 | − | 1500 53 |
| = | 90 53 |
90 53 | = | ( | 30 | − | X | ) | − | ( | 30 | − | X | ) | ÷ | 53 50 | + | X | − | X | ÷ | 101 100 | + | 30 | × | 80 100 | − | X |
| 方程右边 = | ( | 30 | − | X | ) | − | ( | 30 | − | X | ) | × | 50 53 | + | X | − | X | × | 100 101 | + | 24 | − | X |
| = | ( | 30 | − | X | ) | − | ( | 30 | − | X | ) | × | 50 53 | − | 100 101 | X | + | 24 |
90 53 | = | ( | 30 | − | X | ) | − | ( | 30 | − | X | ) | × | 50 53 | − | 100 101 | X | + | 24 |
| 方程右边 = | 30 | − | X | − | ( | 30 | − | X | ) | × | 50 53 | − | 100 101 | X | + | 24 |
| = | 54 | − | 201 101 | X | − | ( | 30 | − | X | ) | × | 50 53 |
| = | 54 | − | 201 101 | X | − | 30 | × | 50 53 | + | X | × | 50 53 |
| = | 54 | − | 201 101 | X | − | 1500 53 | + | X | × | 50 53 |
| = | 1362 53 | − | 5603 5353 | X |
90 53 | = | 1362 53 | − | 5603 5353 | X |
5603 5353 | X | = | 1362 53 | − | 90 53 |
5603 5353 | X | = | 24 |
| X | = | 24 | ÷ | 5603 5353 |
| = | 24 | × | 5353 5603 |
| X | = | 128472 5603 |
| X | = | 22.929145 |