| ( | 450 | − | 20000 | ÷ | ( | x | + | 107 5 | ) | ) | ( | x | + | 107 10 | ) | = | 40000 |
| 450 | ( | x | + | 107 10 | ) | − | 20000 | ÷ | ( | x | + | 107 5 | ) | × | ( | x | + | 107 10 | ) | = | 40000 |
| 方程两边同时乘以: | ( | x | + | 107 5 | ) |
| 450 | ( | x | + | 107 10 | ) | ( | x | + | 107 5 | ) | − | 20000 | ( | x | + | 107 10 | ) | = | 40000 | ( | x | + | 107 5 | ) |
| 450 | x | ( | x | + | 107 5 | ) | + | 450 | × | 107 10 | ( | x | + | 107 5 | ) | − | 20000 | ( | x | + | 107 10 | ) | = | 40000 | ( | x | + | 107 5 | ) |
| 450 | x | ( | x | + | 107 5 | ) | + | 450 | × | 107 10 | ( | x | + | 107 5 | ) | − | 20000 | ( | x | + | 107 10 | ) | = | 40000 | x | + | 40000 | × | 107 5 |
| 450 | x | ( | x | + | 107 5 | ) | + | 4815 | ( | x | + | 107 5 | ) | − | 20000 | ( | x | + | 107 10 | ) | = | 40000 | x | + | 856000 |
| 450 | x | x | + | 450 | x | × | 107 5 | + | 4815 | ( | x | + | 107 5 | ) | − | 20000 | ( | x | + | 107 10 | ) | = | 40000 | x | + | 856000 |
| 450 | x | x | + | 9630 | x | + | 4815 | ( | x | + | 107 5 | ) | − | 20000 | ( | x | + | 107 10 | ) | = | 40000 | x | + | 856000 |
| 450 | x | x | + | 9630 | x | + | 4815 | x | + | 4815 | × | 107 5 | − | 20000 | ( | x | + | 107 10 | ) | = | 40000 | x | + | 856000 |
| 450 | x | x | + | 9630 | x | + | 4815 | x | + | 103041 | − | 20000 | ( | x | + | 107 10 | ) | = | 40000 | x | + | 856000 |
| 450 | x | x | + | 14445 | x | + | 103041 | − | 20000 | ( | x | + | 107 10 | ) | = | 40000 | x | + | 856000 |
| 450 | x | x | + | 14445 | x | + | 103041 | − | 20000 | x | − | 20000 | × | 107 10 | = | 40000 | x | + | 856000 |
| 450 | x | x | + | 14445 | x | + | 103041 | − | 20000 | x | − | 214000 | = | 40000 | x | + | 856000 |
| 450 | x | x | − | 5555 | x | − | 110959 | = | 40000 | x | + | 856000 |