| 144 | x | × | 2 | + | ( | 12 | − | 13 | x | ) | × | 2 | = | 169 | x | × | 2 |
| 方程左边 = | 288 | x | + | ( | 12 | − | 13 | x | ) | × | 2 |
| 288 | x | + | ( | 12 | − | 13 | x | ) | × | 2 | = | 169 | x | × | 2 |
| 方程左边 = | 288 | x | + | 12 | × | 2 | − | 13 | x | × | 2 |
| = | 288 | x | + | 24 | − | 26 | x |
| = | 262 | x | + | 24 |
| 262 | x | + | 24 | = | 169 | x | × | 2 |
| 方程右边 = | 338 | x |
| 262 | x | + | 24 | = | 338 | x |
| 262 | x | − | 338 | x | = | - | 24 |
| - | 76 | x | = | - | 24 |
| 24 | = | 76 | x |
| 76 | x | = | 24 |
| x | = | 24 | ÷ | 76 |
| = | 24 | × | 1 76 |
| = | 6 | × | 1 19 |
| x | = | 6 19 |
| x | = | 0.315789 |