| x | = | 1 100 | × | 1 | ÷ | ( | 21 20 | × | 253 100 | × | 2 | × | 15707963 5000000 | ÷ | 100000000 | − | 1 | ÷ | ( | 21 20 | × | 15707963 5000000 | × | 1000000 | ) | ) |
| 方程两边同时乘以: | ( | 21 20 | × | 253 100 | × | 2 | × | 15707963 5000000 | ÷ | 100000000 | − | 1 | ÷ | ( | 21 20 | × | 15707963 5000000 | × | 1000000 | ) | ) |
| x | ( | 21 20 | × | 253 100 | × | 2 | × | 15707963 5000000 | ÷ | 100000000 | − | 1 | ÷ | ( | 21 20 | × | 15707963 5000000 | × | 1000000 | ) | ) | = | 1 100 | × | 1 |
| x | × | 21 20 | × | 253 100 | × | 2 | × | 15707963 5000000 | ÷ | 100000000 | − | x | × | 1 | ÷ | ( | 21 20 | × | 15707963 5000000 | × | 1000000 | ) | = | 1 100 | × | 1 |