| ( | 79 | − | 5 | ) | x | + | ( | 88 | − | 66 | ) | ( | 50 | − | x | ) | = | 3160 |
| 方程左边 = | 79 | x | − | 5 | x | + | ( | 88 | − | 66 | ) | ( | 50 | − | x | ) |
| = | 74 | x | + | ( | 88 | − | 66 | ) | ( | 50 | − | x | ) |
| = | 74 | x | + | 88 | ( | 50 | − | x | ) | − | 66 | ( | 50 | − | x | ) |
| = | 74 | x | + | 88 | × | 50 | − | 88 | x | − | 66 | ( | 50 | − | x | ) |
| = | 74 | x | + | 4400 | − | 88 | x | − | 66 | ( | 50 | − | x | ) |
| = | - | 14 | x | + | 4400 | − | 66 | ( | 50 | − | x | ) |
| = | - | 14 | x | + | 4400 | − | 66 | × | 50 | + | 66 | x |
| = | - | 14 | x | + | 4400 | − | 3300 | + | 66 | x |
| = | 52 | x | + | 1100 |
| 52 | x | + | 1100 | = | 3160 |
| 52 | x | = | 3160 | − | 1100 |
| 52 | x | = | 2060 |
| x | = | 2060 | ÷ | 52 |
| = | 2060 | × | 1 52 |
| = | 515 | × | 1 13 |
| x | = | 515 13 |
| x | = | 39.615385 |