| 2 | ( | 5 | + | x | + | 36 | ) | = | 442 5 | + | 442 5 | + | 202 | − | 62 | − | x |
| 方程左边 = | 2 | × | 5 | + | 2 | x | + | 2 | × | 36 |
| = | 10 | + | 2 | x | + | 72 |
| = | 82 | + | 2 | x |
| 82 | + | 2 | x | = | 442 5 | + | 442 5 | + | 202 | − | 62 | − | x |
| 方程右边 = | 1584 5 | − | x |
| 82 | + | 2 | x | = | 1584 5 | − | x |
| 2 | x | + | x | = | 1584 5 | − | 82 |
| 3 | x | = | 1584 5 | − | 82 |
| 3 | x | = | 1174 5 |
| x | = | 1174 5 | ÷ | 3 |
| = | 1174 5 | × | 1 3 |
| x | = | 1174 15 |
| x | = | 78.266667 |