| ( | x | − | 20 | ) | ( | 1 | − | 1 4 | ) | ÷ | 650 | = | ( | x | − | 300 | × | 3 25 | − | 200 | × | 1 10 | ) | ( | 1 | − | 1 4 | ) | ÷ | 500 |
| 方程左边 = | x | ( | 1 | − | 1 4 | ) | × | 1 650 | − | 20 | ( | 1 | − | 1 4 | ) | × | 1 650 |
| = | x | ( | 1 | − | 1 4 | ) | × | 1 650 | − | 2 65 | ( | 1 | − | 1 4 | ) |
| = | x | × | 1 | × | 1 650 | − | x | × | 1 4 | × | 1 650 | − | 2 65 | ( | 1 | − | 1 4 | ) |
| = | x | × | 1 650 | − | x | × | 1 2600 | − | 2 65 | ( | 1 | − | 1 4 | ) |
| = | 3 2600 | x | − | 2 65 | ( | 1 | − | 1 4 | ) |
| = | 3 2600 | x | − | 2 65 | × | 1 | + | 2 65 | × | 1 4 |
| = | 3 2600 | x | − | 2 65 | + | 1 130 |
| = | 3 2600 | x | − | 3 130 |
3 2600 | x | − | 3 130 | = | ( | x | − | 300 | × | 3 25 | − | 200 | × | 1 10 | ) | ( | 1 | − | 1 4 | ) | ÷ | 500 |
| 方程右边 = | x | ( | 1 | − | 1 4 | ) | × | 1 500 | − | 300 | × | 3 25 | ( | 1 | − | 1 4 | ) | × | 1 500 | − | 200 | × | 1 10 | ( | 1 | − | 1 4 | ) | × | 1 500 |
| = | x | ( | 1 | − | 1 4 | ) | × | 1 500 | − | 9 125 | ( | 1 | − | 1 4 | ) | − | 1 25 | ( | 1 | − | 1 4 | ) |
| = | x | × | 1 | × | 1 500 | − | x | × | 1 4 | × | 1 500 | − | 9 125 | ( | 1 | − | 1 4 | ) | − | 1 25 | ( | 1 | − | 1 4 | ) |
| = | x | × | 1 500 | − | x | × | 1 2000 | − | 9 125 | ( | 1 | − | 1 4 | ) | − | 1 25 | ( | 1 | − | 1 4 | ) |
| = | 3 2000 | x | − | 9 125 | ( | 1 | − | 1 4 | ) | − | 1 25 | ( | 1 | − | 1 4 | ) |
| = | 3 2000 | x | − | 9 125 | × | 1 | + | 9 125 | × | 1 4 | − | 1 25 | ( | 1 | − | 1 4 | ) |
| = | 3 2000 | x | − | 9 125 | + | 9 500 | − | 1 25 | ( | 1 | − | 1 4 | ) |
| = | 3 2000 | x | − | 27 500 | − | 1 25 | ( | 1 | − | 1 4 | ) |
| = | 3 2000 | x | − | 27 500 | − | 1 25 | × | 1 | + | 1 25 | × | 1 4 |
| = | 3 2000 | x | − | 27 500 | − | 1 25 | + | 1 100 |
| = | 3 2000 | x | − | 21 250 |
3 2600 | x | − | 3 130 | = | 3 2000 | x | − | 21 250 |
3 2600 | x | − | 3 2000 | x | = | - | 21 250 | + | 3 130 |
| - | 9 26000 | x | = | - | 21 250 | + | 3 130 |
| - | 9 26000 | x | = | - | 99 1625 |
99 1625 | = | 9 26000 | x |
9 26000 | x | = | 99 1625 |
| x | = | 99 1625 | ÷ | 9 26000 |
| = | 99 1625 | × | 26000 9 |
| = | 11 | × | 16 |
| x | = | 176 |