| 5 | × | 220 | + | 92 | x | = | 92 | ( | 30 | − | x | ) | + | 80 | ( | 2 | + | x | ) |
| 方程左边 = | 1100 | + | 92 | x |
| 1100 | + | 92 | x | = | 92 | ( | 30 | − | x | ) | + | 80 | ( | 2 | + | x | ) |
| 方程右边 = | 92 | × | 30 | − | 92 | x | + | 80 | ( | 2 | + | x | ) |
| = | 2760 | − | 92 | x | + | 80 | ( | 2 | + | x | ) |
| = | 2760 | − | 92 | x | + | 80 | × | 2 | + | 80 | x |
| = | 2760 | − | 92 | x | + | 160 | + | 80 | x |
| = | 2920 | − | 12 | x |
| 1100 | + | 92 | x | = | 2920 | − | 12 | x |
| 92 | x | + | 12 | x | = | 2920 | − | 1100 |
| 104 | x | = | 2920 | − | 1100 |
| 104 | x | = | 1820 |
| x | = | 1820 | ÷ | 104 |
| = | 1820 | × | 1 104 |
| = | 35 | × | 1 2 |
| x | = | 35 2 |
| x | = | 17.5 |