| ( | 13 | − | 3 | x | ) | ÷ | 2 | − | ( | 5 | x | − | 4 | ) | ÷ | 3 | = | - | 3 |
| 方程左边 = | 13 | × | 1 2 | − | 3 | x | × | 1 2 | − | ( | 5 | x | − | 4 | ) | × | 1 3 |
| = | 13 2 | − | 3 2 | x | − | ( | 5 | x | − | 4 | ) | × | 1 3 |
| = | 13 2 | − | 3 2 | x | − | 5 | x | × | 1 3 | + | 4 | × | 1 3 |
| = | 13 2 | − | 3 2 | x | − | 5 3 | x | + | 4 3 |
| = | 47 6 | − | 19 6 | x |
47 6 | − | 19 6 | x | = | - | 3 |
| - | 19 6 | x | = | - | 3 | − | 47 6 |
| - | 19 6 | x | = | - | 65 6 |
65 6 | = | 19 6 | x |
19 6 | x | = | 65 6 |
| x | = | 65 6 | ÷ | 19 6 |
| = | 65 6 | × | 6 19 |
| = | 65 | × | 1 19 |
| x | = | 65 19 |
| x | = | 3.421053 |