| ( | ( | x | − | 200 | × | 1 10 | ) | × | 3 4 | ) | ÷ | 40 | + | 500 | ÷ | 20 | = | ( | ( | x | − | 20 | + | 500 | × | 3 25 | ) | × | 3 4 | ) | ÷ | 40 |
| 方程左边 = | ( | ( | x | − | 200 | × | 1 10 | ) | × | 3 4 | ) | × | 1 40 | + | 25 |
| ( | ( | x | − | 200 | × | 1 10 | ) | × | 3 4 | ) | × | 1 40 | + | 25 | = | ( | ( | x | − | 20 | + | 500 | × | 3 25 | ) | × | 3 4 | ) | ÷ | 40 |
| 方程左边 = | ( | x | − | 200 | × | 1 10 | ) | × | 3 4 | × | 1 40 | + | 25 |
| = | ( | x | − | 200 | × | 1 10 | ) | × | 3 160 | + | 25 |
| = | x | × | 3 160 | − | 200 | × | 1 10 | × | 3 160 | + | 25 |
| = | x | × | 3 160 | − | 3 8 | + | 25 |
| = | 3 160 | x | + | 197 8 |
3 160 | x | + | 197 8 | = | ( | ( | x | − | 20 | + | 500 | × | 3 25 | ) | × | 3 4 | ) | ÷ | 40 |
| 方程右边 = | ( | x | − | 20 | + | 500 | × | 3 25 | ) | × | 3 4 | × | 1 40 |
| = | ( | x | − | 20 | + | 500 | × | 3 25 | ) | × | 3 160 |
| = | x | × | 3 160 | − | 20 | × | 3 160 | + | 500 | × | 3 25 | × | 3 160 |
| = | x | × | 3 160 | − | 3 8 | + | 9 8 |
| = | 3 160 | x | + | 3 4 |
3 160 | x | + | 197 8 | = | 3 160 | x | + | 3 4 |
3 160 | x | − | 3 160 | x | = | 3 4 | − | 197 8 |
| 0 | x | = | 3 4 | − | 197 8 |
| 0 | x | = | - | 191 8 |