10 | − | x | = | ( | 8 5 | − | 2 125 | x | ) | ( | 9 | − | x | ) |
方程右边 = | 8 5 | ( | 9 | − | x | ) | − | 2 125 | x | ( | 9 | − | x | ) |
= | 8 5 | × | 9 | − | 8 5 | x | − | 2 125 | x | ( | 9 | − | x | ) |
= | 72 5 | − | 8 5 | x | − | 2 125 | x | ( | 9 | − | x | ) |
= | 72 5 | − | 8 5 | x | − | 2 125 | x | × | 9 | + | 2 125 | x | x |
= | 72 5 | − | 8 5 | x | − | 18 125 | x | + | 2 125 | x | x |
= | 72 5 | − | 218 125 | x | + | 2 125 | x | x |
10 | − | x | = | 72 5 | − | 218 125 | x | + | 2 125 | x | x |