| 1600 | + | ( | 120 | − | 27 | x | ) | × | 2 | = | ( | 80 | + | 27 | x | ) | × | 2 |
| 方程左边 = | 1600 | + | 120 | × | 2 | − | 27 | x | × | 2 |
| = | 1600 | + | 240 | − | 54 | x |
| = | 1840 | − | 54 | x |
| 1840 | − | 54 | x | = | ( | 80 | + | 27 | x | ) | × | 2 |
| 方程右边 = | 80 | × | 2 | + | 27 | x | × | 2 |
| = | 160 | + | 54 | x |
| 1840 | − | 54 | x | = | 160 | + | 54 | x |
| - | 54 | x | − | 54 | x | = | 160 | − | 1840 |
| - | 108 | x | = | 160 | − | 1840 |
| - | 108 | x | = | - | 1680 |
| 1680 | = | 108 | x |
| 108 | x | = | 1680 |
| x | = | 1680 | ÷ | 108 |
| = | 1680 | × | 1 108 |
| = | 140 | × | 1 9 |
| x | = | 140 9 |
| x | = | 15.555556 |