| ( | 301 20 | − | x | ) | ÷ | 1000 | + | ( | 16 | − | x | ) | ÷ | 15 2 | = | ( | x | − | 2 5 | ) | ÷ | 30 |
| 方程左边 = | 301 20 | × | 1 1000 | − | x | × | 1 1000 | + | ( | 16 | − | x | ) | × | 2 15 |
| = | 301 20000 | − | x | × | 1 1000 | + | ( | 16 | − | x | ) | × | 2 15 |
| = | 301 20000 | − | 1 1000 | x | + | 16 | × | 2 15 | − | x | × | 2 15 |
| = | 301 20000 | − | 1 1000 | x | + | 32 15 | − | x | × | 2 15 |
| = | 128903 60000 | − | 403 3000 | x |
128903 60000 | − | 403 3000 | x | = | ( | x | − | 2 5 | ) | ÷ | 30 |
| 方程右边 = | x | × | 1 30 | − | 2 5 | × | 1 30 |
| = | x | × | 1 30 | − | 1 75 |
128903 60000 | − | 403 3000 | x | = | 1 30 | x | − | 1 75 |
| - | 403 3000 | x | − | 1 30 | x | = | - | 1 75 | − | 128903 60000 |
| - | 503 3000 | x | = | - | 1 75 | − | 128903 60000 |
| - | 503 3000 | x | = | - | 129703 60000 |
129703 60000 | = | 503 3000 | x |
503 3000 | x | = | 129703 60000 |
| x | = | 129703 60000 | ÷ | 503 3000 |
| = | 129703 60000 | × | 3000 503 |
| = | 129703 20 | × | 1 503 |
| x | = | 129703 10060 |
| x | = | 12.892942 |