| 2 | x | + | 2 | ( | 69 25 | + | x | ) | = | 3 | ( | 69 25 | − | x | ) |
| 方程左边 = | 2 | x | + | 2 | × | 69 25 | + | 2 | x |
| = | 2 | x | + | 138 25 | + | 2 | x |
| = | 4 | x | + | 138 25 |
| 4 | x | + | 138 25 | = | 3 | ( | 69 25 | − | x | ) |
| 方程右边 = | 3 | × | 69 25 | − | 3 | x |
| = | 207 25 | − | 3 | x |
| 4 | x | + | 138 25 | = | 207 25 | − | 3 | x |
| 4 | x | + | 3 | x | = | 207 25 | − | 138 25 |
| 7 | x | = | 207 25 | − | 138 25 |
| 7 | x | = | 69 25 |
| x | = | 69 25 | ÷ | 7 |
| = | 69 25 | × | 1 7 |
| x | = | 69 175 |
| x | = | 0.394286 |