| ( | x | + | 3 | ) | ÷ | 4 | = | 1 | + | ( | 3 | x | − | 10 | ) | ÷ | 5 |
| 方程左边 = | x | × | 1 4 | + | 3 | × | 1 4 |
| = | x | × | 1 4 | + | 3 4 |
1 4 | x | + | 3 4 | = | 1 | + | ( | 3 | x | − | 10 | ) | ÷ | 5 |
| 方程右边 = | 1 | + | 3 | x | × | 1 5 | − | 10 | × | 1 5 |
| = | 1 | + | 3 5 | x | − | 2 |
| = | - | 1 | + | 3 5 | x |
1 4 | x | + | 3 4 | = | - | 1 | + | 3 5 | x |
1 4 | x | − | 3 5 | x | = | - | 1 | − | 3 4 |
| - | 7 20 | x | = | - | 1 | − | 3 4 |
| - | 7 20 | x | = | - | 7 4 |
7 4 | = | 7 20 | x |
7 20 | x | = | 7 4 |
| x | = | 7 4 | ÷ | 7 20 |
| = | 7 4 | × | 20 7 |
| = | 1 | × | 5 |
| x | = | 5 |