| ( | x | − | 2 5 | ) | ÷ | 30 | = | ( | 16 | − | 19 20 | ) | ÷ | 1000 | + | ( | 16 | − | x | ) | ÷ | 15 2 |
| 方程左边 = | x | × | 1 30 | − | 2 5 | × | 1 30 |
| = | x | × | 1 30 | − | 1 75 |
1 30 | x | − | 1 75 | = | ( | 16 | − | 19 20 | ) | ÷ | 1000 | + | ( | 16 | − | x | ) | ÷ | 15 2 |
| 方程右边 = | 16 | × | 1 1000 | − | 19 20 | × | 1 1000 | + | ( | 16 | − | x | ) | × | 2 15 |
| = | 2 125 | − | 19 20000 | + | ( | 16 | − | x | ) | × | 2 15 |
| = | 301 20000 | + | ( | 16 | − | x | ) | × | 2 15 |
| = | 301 20000 | + | 16 | × | 2 15 | − | x | × | 2 15 |
| = | 301 20000 | + | 32 15 | − | x | × | 2 15 |
| = | 128903 60000 | − | 2 15 | x |
1 30 | x | − | 1 75 | = | 128903 60000 | − | 2 15 | x |
1 30 | x | + | 2 15 | x | = | 128903 60000 | + | 1 75 |
1 6 | x | = | 128903 60000 | + | 1 75 |
1 6 | x | = | 129703 60000 |
| x | = | 129703 60000 | ÷ | 1 6 |
| = | 129703 60000 | × | 6 |
| = | 129703 10000 | × | 1 |
| x | = | 129703 10000 |
| x | = | 12.9703 |