| ( | 1 | + | 73 50 | x | ) | ( | 27 25 | x | − | 43 125 | ) | = | 123 50 | x |
| 方程左边 = | 1 | ( | 27 25 | x | − | 43 125 | ) | + | 73 50 | x | ( | 27 25 | x | − | 43 125 | ) |
| = | 1 | × | 27 25 | x | − | 1 | × | 43 125 | + | 73 50 | x | ( | 27 25 | x | − | 43 125 | ) |
| = | 27 25 | x | − | 43 125 | + | 73 50 | x | ( | 27 25 | x | − | 43 125 | ) |
| = | 27 25 | x | − | 43 125 | + | 73 50 | x | × | 27 25 | x | − | 73 50 | x | × | 43 125 |
| = | 27 25 | x | − | 43 125 | + | 1971 1250 | x | x | − | 3139 6250 | x |
| = | 3611 6250 | x | − | 43 125 | + | 1971 1250 | x | x |
3611 6250 | x | − | 43 125 | + | 1971 1250 | x | x | = | 123 50 | x |