| - | 83 | ÷ | ( | - | 17 | + | 2 | ( | 3 | x | + | 5 | ) | ) | + | 8 | = | 7 |
| 方程两边同时乘以: | ( | - | 17 | + | 2 | ( | 3 | x | + | 5 | ) | ) |
| - | 83 | + | 8 | ( | - | 17 | + | 2 | ( | 3 | x | + | 5 | ) | ) | = | 7 | ( | - | 17 | + | 2 | ( | 3 | x | + | 5 | ) | ) |
| - | 83 | − | 8 | × | 17 | + | 8 | × | 2 | ( | 3 | x | + | 5 | ) | = | 7 | ( | - | 17 | + | 2 | ( | 3 | x | + | 5 | ) | ) |
| - | 83 | − | 8 | × | 17 | + | 8 | × | 2 | ( | 3 | x | + | 5 | ) | = | - | 7 | × | 17 | + | 7 | × | 2 | ( | 3 | x | + | 5 | ) |
| - | 83 | − | 136 | + | 16 | ( | 3 | x | + | 5 | ) | = | - | 119 | + | 14 | ( | 3 | x | + | 5 | ) |
| - | 219 | + | 16 | ( | 3 | x | + | 5 | ) | = | - | 119 | + | 14 | ( | 3 | x | + | 5 | ) |
| - | 219 | + | 16 | × | 3 | x | + | 16 | × | 5 | = | - | 119 | + | 14 | ( | 3 | x | + | 5 | ) |
| - | 219 | + | 16 | × | 3 | x | + | 16 | × | 5 | = | - | 119 | + | 14 | × | 3 | x | + | 14 | × | 5 |
| - | 219 | + | 48 | x | + | 80 | = | - | 119 | + | 42 | x | + | 70 |
| - | 139 | + | 48 | x | = | - | 49 | + | 42 | x |
| 48 | x | − | 42 | x | = | - | 49 | + | 139 |
| 6 | x | = | - | 49 | + | 139 |
| 6 | x | = | 90 |
| x | = | 90 | ÷ | 6 |
| = | 90 | × | 1 6 |
| = | 15 | × | 1 |
| x | = | 15 |