| ( | 13 100 | ÷ | 87 100 | ) | x | ÷ | ( | x | + | 13 | x | ÷ | 87 | ) | = | 273 100 | ÷ | 9 |
| 方程两边同时乘以: | ( | x | + | 13 | x | ÷ | 87 | ) |
| ( | 13 100 | ÷ | 87 100 | ) | x | = | 273 100 | ÷ | 9 | × | ( | x | + | 13 | x | ÷ | 87 | ) |
13 100 | ÷ | 87 100 | × | x | = | 273 100 | ÷ | 9 | × | ( | x | + | 13 | x | ÷ | 87 | ) |
13 100 | ÷ | 87 100 | × | x | = | 273 100 | ÷ | 9 | × | x | + | 273 100 | ÷ | 9 | × | 13 | x | ÷ | 87 |
13 87 | x | = | 91 300 | x | + | 1183 26100 | x |
13 87 | x | = | 91 261 | x |
13 87 | x | − | 91 261 | x | = | 0 |
| - | 52 261 | x | = | 0 |
| - | 0 | = | 52 261 | x |
52 261 | x | = | - | 0 |
| x | = | - | 0 | ÷ | 52 261 |
| = | - | 0 | × | 261 52 |
| x | = | 0 |
| x | = | 0 |