| ( | x | − | 3 | ) | ÷ | 8 | = | ( | x | + | 4 | ) | ÷ | 7 |
| 方程左边 = | x | × | 1 8 | − | 3 | × | 1 8 |
| = | x | × | 1 8 | − | 3 8 |
1 8 | x | − | 3 8 | = | ( | x | + | 4 | ) | ÷ | 7 |
| 方程右边 = | x | × | 1 7 | + | 4 | × | 1 7 |
| = | x | × | 1 7 | + | 4 7 |
1 8 | x | − | 3 8 | = | 1 7 | x | + | 4 7 |
1 8 | x | − | 1 7 | x | = | 4 7 | + | 3 8 |
| - | 1 56 | x | = | 4 7 | + | 3 8 |
| - | 1 56 | x | = | 53 56 |
| - | 53 56 | = | 1 56 | x |
1 56 | x | = | - | 53 56 |
| x | = | - | 53 56 | ÷ | 1 56 |
| = | - | 53 56 | × | 56 |
| = | - | 53 | × | 1 |
| x | = | - | 53 |