| 800 | + | ( | x | − | 6 | ) | × | 50 | + | 200 | − | ( | 300 | − | 50 | x | ) | × | 2 | = | 1250 |
| 方程左边 = | 1000 | + | ( | x | − | 6 | ) | × | 50 | − | ( | 300 | − | 50 | x | ) | × | 2 |
| 1000 | + | ( | x | − | 6 | ) | × | 50 | − | ( | 300 | − | 50 | x | ) | × | 2 | = | 1250 |
| 方程左边 = | 1000 | + | x | × | 50 | − | 6 | × | 50 | − | ( | 300 | − | 50 | x | ) | × | 2 |
| = | 1000 | + | x | × | 50 | − | 300 | − | ( | 300 | − | 50 | x | ) | × | 2 |
| = | 700 | + | 50 | x | − | ( | 300 | − | 50 | x | ) | × | 2 |
| = | 700 | + | 50 | x | − | 300 | × | 2 | + | 50 | x | × | 2 |
| = | 700 | + | 50 | x | − | 600 | + | 100 | x |
| = | 100 | + | 150 | x |
| 100 | + | 150 | x | = | 1250 |
| 150 | x | = | 1250 | − | 100 |
| 150 | x | = | 1150 |
| x | = | 1150 | ÷ | 150 |
| = | 1150 | × | 1 150 |
| = | 23 | × | 1 3 |
| x | = | 23 3 |
| x | = | 7.666667 |