| 60 | + | 12 | ( | x | − | 10 | ) | + | 30 | ( | x | − | 14 | − | 65 | ) | = | 1000 |
| 方程左边 = | 60 | + | 12 | x | − | 12 | × | 10 | + | 30 | ( | x | − | 14 | − | 65 | ) |
| = | 60 | + | 12 | x | − | 120 | + | 30 | ( | x | − | 14 | − | 65 | ) |
| = | - | 60 | + | 12 | x | + | 30 | ( | x | − | 14 | − | 65 | ) |
| = | - | 60 | + | 12 | x | + | 30 | x | − | 30 | × | 14 | − | 30 | × | 65 |
| = | - | 60 | + | 12 | x | + | 30 | x | − | 420 | − | 1950 |
| = | - | 2430 | + | 42 | x |
| - | 2430 | + | 42 | x | = | 1000 |
| 42 | x | = | 1000 | + | 2430 |
| 42 | x | = | 3430 |
| x | = | 3430 | ÷ | 42 |
| = | 3430 | × | 1 42 |
| = | 245 | × | 1 3 |
| x | = | 245 3 |
| x | = | 81.666667 |