| ( | x | + | 2 | ) | ÷ | 121 | = | ( | x | + | 109 | ) | ÷ | 122 |
| 方程左边 = | x | × | 1 121 | + | 2 | × | 1 121 |
| = | x | × | 1 121 | + | 2 121 |
1 121 | x | + | 2 121 | = | ( | x | + | 109 | ) | ÷ | 122 |
| 方程右边 = | x | × | 1 122 | + | 109 | × | 1 122 |
| = | x | × | 1 122 | + | 109 122 |
1 121 | x | + | 2 121 | = | 1 122 | x | + | 109 122 |
1 121 | x | − | 1 122 | x | = | 109 122 | − | 2 121 |
1 14762 | x | = | 109 122 | − | 2 121 |
1 14762 | x | = | 12945 14762 |
| x | = | 12945 14762 | ÷ | 1 14762 |
| = | 12945 14762 | × | 14762 |
| = | 12945 | × | 1 |
| x | = | 12945 |