| ( | 27 10 | x | − | 135 2 | ) | ÷ | 3 | = | ( | 3 | + | 4 5 | x | ) | ÷ | 2 |
| 方程左边 = | 27 10 | x | × | 1 3 | − | 135 2 | × | 1 3 |
| = | 9 10 | x | − | 45 2 |
9 10 | x | − | 45 2 | = | ( | 3 | + | 4 5 | x | ) | ÷ | 2 |
| 方程右边 = | 3 | × | 1 2 | + | 4 5 | x | × | 1 2 |
| = | 3 2 | + | 2 5 | x |
9 10 | x | − | 45 2 | = | 3 2 | + | 2 5 | x |
9 10 | x | − | 2 5 | x | = | 3 2 | + | 45 2 |
1 2 | x | = | 3 2 | + | 45 2 |
1 2 | x | = | 24 |
| x | = | 24 | ÷ | 1 2 |
| = | 24 | × | 2 |
| x | = | 48 |