| ( | x | × | 6 5 | × | 9 10 | − | x | ) | + | ( | 2000 | − | x | ) | × | 23 20 | × | 9 10 | ÷ | ( | 2000 | − | x | ) | = | 131 |
| 方程两边同时乘以: | ( | 2000 | − | x | ) |
| ( | x | × | 6 5 | × | 9 10 | − | x | ) | ( | 2000 | − | x | ) | + | ( | 2000 | − | x | ) | × | 23 20 | × | 9 10 | = | 131 | ( | 2000 | − | x | ) |
| x | × | 6 5 | × | 9 10 | ( | 2000 | − | x | ) | − | x | ( | 2000 | − | x | ) | + | ( | 2000 | − | x | ) | × | 23 20 | × | 9 10 | = | 131 | ( | 2000 | − | x | ) |
| x | × | 6 5 | × | 9 10 | ( | 2000 | − | x | ) | − | x | ( | 2000 | − | x | ) | + | ( | 2000 | − | x | ) | × | 23 20 | × | 9 10 | = | 131 | × | 2000 | − | 131 | x |
| x | × | 27 25 | ( | 2000 | − | x | ) | − | x | ( | 2000 | − | x | ) | + | ( | 2000 | − | x | ) | × | 207 200 | = | 262000 | − | 131 | x |
| x | × | 27 25 | × | 2000 | − | x | × | 27 25 | x | − | x | ( | 2000 | − | x | ) | + | ( | 2000 | − | x | ) | × | 207 200 | = | 262000 | − | 131 | x |
| x | × | 2160 | − | x | × | 27 25 | x | − | x | ( | 2000 | − | x | ) | + | ( | 2000 | − | x | ) | × | 207 200 | = | 262000 | − | 131 | x |
| 2160 | x | − | x | × | 27 25 | x | − | x | × | 2000 | + | x | x | + | ( | 2000 | − | x | ) | × | 207 200 | = | 262000 | − | 131 | x |
| 160 | x | − | x | × | 27 25 | x | + | x | x | + | ( | 2000 | − | x | ) | × | 207 200 | = | 262000 | − | 131 | x |
| 160 | x | − | x | × | 27 25 | x | + | x | x | + | 2000 | × | 207 200 | − | x | × | 207 200 | = | 262000 | − | 131 | x |
| 160 | x | − | x | × | 27 25 | x | + | x | x | + | 2070 | − | x | × | 207 200 | = | 262000 | − | 131 | x |
31793 200 | x | − | x | × | 27 25 | x | + | x | x | + | 2070 | = | 262000 | − | 131 | x |