| 400 | + | 650 | × | 3 | x | − | 750 | × | 3 | ( | 26 | − | x | ) | = | 700 |
| 方程左边 = | 400 | + | 1950 | x | − | 2250 | ( | 26 | − | x | ) |
| 400 | + | 1950 | x | − | 2250 | ( | 26 | − | x | ) | = | 700 |
| 方程左边 = | 400 | + | 1950 | x | − | 2250 | × | 26 | + | 2250 | x |
| = | 400 | + | 1950 | x | − | 58500 | + | 2250 | x |
| = | - | 58100 | + | 4200 | x |
| - | 58100 | + | 4200 | x | = | 700 |
| 4200 | x | = | 700 | + | 58100 |
| 4200 | x | = | 58800 |
| x | = | 58800 | ÷ | 4200 |
| = | 58800 | × | 1 4200 |
| = | 14 | × | 1 |
| x | = | 14 |