| ( | 821 100 | x | − | 3 5 | x | ) | + | ( | 821 100 | x | − | 3 5 | x | ) | + | ( | 821 100 | x | − | 3 5 | x | ) | + | ( | 821 100 | x | − | 3 5 | x | ) | = | 500 |
| 方程左边 = | 821 100 | x | − | 3 5 | x | + | ( | 821 100 | x | − | 3 5 | x | ) | + | ( | 821 100 | x | − | 3 5 | x | ) | + | ( | 821 100 | x | − | 3 5 | x | ) |
| = | 761 100 | x | + | ( | 821 100 | x | − | 3 5 | x | ) | + | ( | 821 100 | x | − | 3 5 | x | ) | + | ( | 821 100 | x | − | 3 5 | x | ) |
| = | 761 100 | x | + | 821 100 | x | − | 3 5 | x | + | ( | 821 100 | x | − | 3 5 | x | ) | + | ( | 821 100 | x | − | 3 5 | x | ) |
| = | 761 50 | x | + | ( | 821 100 | x | − | 3 5 | x | ) | + | ( | 821 100 | x | − | 3 5 | x | ) |
| = | 761 50 | x | + | 821 100 | x | − | 3 5 | x | + | ( | 821 100 | x | − | 3 5 | x | ) |
| = | 2283 100 | x | + | ( | 821 100 | x | − | 3 5 | x | ) |
| = | 2283 100 | x | + | 821 100 | x | − | 3 5 | x |
| = | 761 25 | x |
761 25 | x | = | 500 |
| x | = | 500 | ÷ | 761 25 |
| = | 500 | × | 25 761 |
| x | = | 12500 761 |
| x | = | 16.425756 |