| ( | ( | x | − | 144 | ) | − | ( | x | − | 240 | ) | ) | ÷ | ( | x | − | 240 | ) | = | 1 10 |
| 方程两边同时乘以: | ( | x | − | 240 | ) |
| ( | ( | x | − | 144 | ) | − | ( | x | − | 240 | ) | ) | = | 1 10 | ( | x | − | 240 | ) |
| ( | x | − | 144 | ) | − | ( | x | − | 240 | ) | = | 1 10 | ( | x | − | 240 | ) |
| ( | x | − | 144 | ) | − | ( | x | − | 240 | ) | = | 1 10 | x | − | 1 10 | × | 240 |
| ( | x | − | 144 | ) | − | ( | x | − | 240 | ) | = | 1 10 | x | − | 24 |
| x | − | 144 | − | ( | x | − | 240 | ) | = | 1 10 | x | − | 24 |
| x | − | 144 | − | x | + | 240 | = | 1 10 | x | − | 24 |
| 0 | x | + | 96 | = | 1 10 | x | − | 24 |
| - | 1 10 | x | = | - | 24 | − | 96 |
| - | 1 10 | x | = | - | 120 |
| 120 | = | 1 10 | x |
1 10 | x | = | 120 |
| x | = | 120 | ÷ | 1 10 |
| = | 120 | × | 10 |
| x | = | 1200 |