| ( | 200 | + | x | − | 20 | ) | ( | 60 | − | 1 10 | ) | = | 14000 |
| 方程左边 = | 200 | ( | 60 | − | 1 10 | ) | + | x | ( | 60 | − | 1 10 | ) | − | 20 | ( | 60 | − | 1 10 | ) |
| = | 200 | × | 60 | − | 200 | × | 1 10 | + | x | ( | 60 | − | 1 10 | ) | − | 20 | ( | 60 | − | 1 10 | ) |
| = | 12000 | − | 20 | + | x | ( | 60 | − | 1 10 | ) | − | 20 | ( | 60 | − | 1 10 | ) |
| = | 11980 | + | x | ( | 60 | − | 1 10 | ) | − | 20 | ( | 60 | − | 1 10 | ) |
| = | 11980 | + | x | × | 60 | − | x | × | 1 10 | − | 20 | ( | 60 | − | 1 10 | ) |
| = | 11980 | + | 599 10 | x | − | 20 | ( | 60 | − | 1 10 | ) |
| = | 11980 | + | 599 10 | x | − | 20 | × | 60 | + | 20 | × | 1 10 |
| = | 11980 | + | 599 10 | x | − | 1200 | + | 2 |
| = | 10782 | + | 599 10 | x |
| 10782 | + | 599 10 | x | = | 14000 |
599 10 | x | = | 14000 | − | 10782 |
599 10 | x | = | 3218 |
| x | = | 3218 | ÷ | 599 10 |
| = | 3218 | × | 10 599 |
| x | = | 32180 599 |
| x | = | 53.722871 |