| 6 | × | 10 | + | 12 | ( | 65 | − | 24 | ) | + | ( | x | − | 65 | ) | × | 30 | = | 1000 |
| 方程左边 = | 60 | + | 12 | ( | 65 | − | 24 | ) | + | ( | x | − | 65 | ) | × | 30 |
| 60 | + | 12 | ( | 65 | − | 24 | ) | + | ( | x | − | 65 | ) | × | 30 | = | 1000 |
| 方程左边 = | 60 | + | 12 | × | 65 | − | 12 | × | 24 | + | ( | x | − | 65 | ) | × | 30 |
| = | 60 | + | 780 | − | 288 | + | ( | x | − | 65 | ) | × | 30 |
| = | 552 | + | ( | x | − | 65 | ) | × | 30 |
| = | 552 | + | x | × | 30 | − | 65 | × | 30 |
| = | 552 | + | x | × | 30 | − | 1950 |
| = | - | 1398 | + | 30 | x |
| - | 1398 | + | 30 | x | = | 1000 |
| 30 | x | = | 1000 | + | 1398 |
| 30 | x | = | 2398 |
| x | = | 2398 | ÷ | 30 |
| = | 2398 | × | 1 30 |
| = | 1199 | × | 1 15 |
| x | = | 1199 15 |
| x | = | 79.933333 |