19 20 | ( | x | − | x | ÷ | 3 | + | x | ÷ | 63 10 | ) | − | ( | ( | x | − | x | ÷ | 3 | + | x | ÷ | 63 10 | ) | ÷ | 63 10 | ) | = | 493 20 |
| 方程左边 = | 19 20 | x | − | 19 20 | x | ÷ | 3 | + | 19 20 | x | ÷ | 63 10 | − | ( | ( | x | − | x | ÷ | 3 | + | x | ÷ | 63 10 | ) | ÷ | 63 10 | ) |
| = | 19 20 | x | − | 19 60 | x | + | 19 126 | x | − | ( | ( | x | − | x | ÷ | 3 | + | x | ÷ | 63 10 | ) | ÷ | 63 10 | ) |
| = | 247 315 | x | − | ( | ( | x | − | x | ÷ | 3 | + | x | ÷ | 63 10 | ) | ÷ | 63 10 | ) |
| = | 247 315 | x | − | ( | x | − | x | ÷ | 3 | + | x | ÷ | 63 10 | ) | ÷ | 63 10 |
| = | 247 315 | x | − | x | × | 10 63 | + | x | ÷ | 3 | × | 10 63 | − | x | ÷ | 63 10 | × | 10 63 |
| = | 247 315 | x | − | x | × | 10 63 | + | x | × | 10 189 | − | x | × | 100 3969 |
| = | 12961 19845 | x |
12961 19845 | x | = | 493 20 |
| x | = | 493 20 | ÷ | 12961 19845 |
| = | 493 20 | × | 19845 12961 |
| = | 493 4 | × | 3969 12961 |
| x | = | 1956717 51844 |
| x | = | 37.7424 |