| 500 | x | + | 300 | ( | 16 | − | x | ) | + | 200 | ( | 15 | − | x | ) | + | 100 | ( | 3 | + | x | ) | = | 9100 |
| 方程左边 = | 500 | x | + | 300 | × | 16 | − | 300 | x | + | 200 | ( | 15 | − | x | ) | + | 100 | ( | 3 | + | x | ) |
| = | 500 | x | + | 4800 | − | 300 | x | + | 200 | ( | 15 | − | x | ) | + | 100 | ( | 3 | + | x | ) |
| = | 200 | x | + | 4800 | + | 200 | ( | 15 | − | x | ) | + | 100 | ( | 3 | + | x | ) |
| = | 200 | x | + | 4800 | + | 200 | × | 15 | − | 200 | x | + | 100 | ( | 3 | + | x | ) |
| = | 200 | x | + | 4800 | + | 3000 | − | 200 | x | + | 100 | ( | 3 | + | x | ) |
| = | 0 | x | + | 7800 | + | 100 | ( | 3 | + | x | ) |
| = | 7800 | + | 100 | × | 3 | + | 100 | x |
| = | 7800 | + | 300 | + | 100 | x |
| = | 8100 | + | 100 | x |
| 8100 | + | 100 | x | = | 9100 |
| 100 | x | = | 9100 | − | 8100 |
| 100 | x | = | 1000 |
| x | = | 1000 | ÷ | 100 |
| = | 1000 | × | 1 100 |
| = | 10 | × | 1 |
| x | = | 10 |