| 4 | × | 1 160 | × | 10 | × | 800 | x | = | 800 | × | 1 160 | × | 10 | ( | x | − | 1 10 | ) | + | 800 | × | 4 | × | 1 160 | × | 10 | × | 1 10 | + | 9 |
| 方程左边 = | 200 | x |
| 200 | x | = | 800 | × | 1 160 | × | 10 | ( | x | − | 1 10 | ) | + | 800 | × | 4 | × | 1 160 | × | 10 | × | 1 10 | + | 9 |
| 方程右边 = | 50 | ( | x | − | 1 10 | ) | + | 20 | + | 9 |
| = | 50 | ( | x | − | 1 10 | ) | + | 29 |
| 200 | x | = | 50 | ( | x | − | 1 10 | ) | + | 29 |
| 方程右边 = | 50 | x | − | 50 | × | 1 10 | + | 29 |
| = | 50 | x | − | 5 | + | 29 |
| = | 50 | x | + | 24 |
| 200 | x | = | 50 | x | + | 24 |
| 200 | x | − | 50 | x | = | 24 |
| 150 | x | = | 24 |
| x | = | 24 | ÷ | 150 |
| = | 24 | × | 1 150 |
| = | 4 | × | 1 25 |
| x | = | 4 25 |
| x | = | 0.16 |