| ( | 1 | + | 73 50 | x | ) | ( | 539 500 | x | − | 43 125 | ) | = | 123 50 | x |
| 方程左边 = | 1 | ( | 539 500 | x | − | 43 125 | ) | + | 73 50 | x | ( | 539 500 | x | − | 43 125 | ) |
| = | 1 | × | 539 500 | x | − | 1 | × | 43 125 | + | 73 50 | x | ( | 539 500 | x | − | 43 125 | ) |
| = | 539 500 | x | − | 43 125 | + | 73 50 | x | ( | 539 500 | x | − | 43 125 | ) |
| = | 539 500 | x | − | 43 125 | + | 73 50 | x | × | 539 500 | x | − | 73 50 | x | × | 43 125 |
| = | 539 500 | x | − | 43 125 | + | 39347 25000 | x | x | − | 3139 6250 | x |
| = | 7197 12500 | x | − | 43 125 | + | 39347 25000 | x | x |
7197 12500 | x | − | 43 125 | + | 39347 25000 | x | x | = | 123 50 | x |