| ( | x | − | 16 100 | ) | × | 80 | = | ( | 18 100 | − | x | ) | × | 160 |
| 方程左边 = | x | × | 80 | − | 16 100 | × | 80 |
| = | x | × | 80 | − | 64 5 |
| 80 | x | − | 64 5 | = | ( | 18 100 | − | x | ) | × | 160 |
| 方程右边 = | 18 100 | × | 160 | − | x | × | 160 |
| = | 144 5 | − | x | × | 160 |
| 80 | x | − | 64 5 | = | 144 5 | − | 160 | x |
| 80 | x | + | 160 | x | = | 144 5 | + | 64 5 |
| 240 | x | = | 144 5 | + | 64 5 |
| 240 | x | = | 208 5 |
| x | = | 208 5 | ÷ | 240 |
| = | 208 5 | × | 1 240 |
| = | 13 5 | × | 1 15 |
| x | = | 13 75 |
| x | = | 0.173333 |