37 10 | ( | 20 | − | x | ) | − | 17 | + | 69 10 | ( | 30 | + | x | ) | − | 113 | = | 929 5 |
| 方程左边 = | 37 10 | ( | 20 | − | x | ) | − | 130 | + | 69 10 | ( | 30 | + | x | ) |
37 10 | ( | 20 | − | x | ) | − | 130 | + | 69 10 | ( | 30 | + | x | ) | = | 929 5 |
| 方程左边 = | 37 10 | × | 20 | − | 37 10 | x | − | 130 | + | 69 10 | ( | 30 | + | x | ) |
| = | 74 | − | 37 10 | x | − | 130 | + | 69 10 | ( | 30 | + | x | ) |
| = | - | 56 | − | 37 10 | x | + | 69 10 | ( | 30 | + | x | ) |
| = | - | 56 | − | 37 10 | x | + | 69 10 | × | 30 | + | 69 10 | x |
| = | - | 56 | − | 37 10 | x | + | 207 | + | 69 10 | x |
| = | 151 | + | 16 5 | x |
| 151 | + | 16 5 | x | = | 929 5 |
16 5 | x | = | 929 5 | − | 151 |
16 5 | x | = | 174 5 |
| x | = | 174 5 | ÷ | 16 5 |
| = | 174 5 | × | 5 16 |
| = | 87 | × | 1 8 |
| x | = | 87 8 |
| x | = | 10.875 |