| ( | 2 | x | + | x | + | 2 | x | − | 15 | + | ( | 2 | x | − | 15 | ) | × | 3 | ) | × | 6 | ÷ | 5 | = | 76 | × | 6 |
| 方程左边 = | ( | 2 | x | + | x | + | 2 | x | − | 15 | + | ( | 2 | x | − | 15 | ) | × | 3 | ) | × | 6 5 |
| ( | 2 | x | + | x | + | 2 | x | − | 15 | + | ( | 2 | x | − | 15 | ) | × | 3 | ) | × | 6 5 | = | 76 | × | 6 |
| 方程左边 = | 2 | x | × | 6 5 | + | x | × | 6 5 | + | 2 | x | × | 6 5 | − | 15 | × | 6 5 | + | ( | 2 | x | − | 15 | ) | × | 3 |
| = | 12 5 | x | + | x | × | 6 5 | + | 12 5 | x | − | 18 | + | ( | 2 | x | − | 15 | ) | × | 18 5 |
| = | 6 | x | − | 18 | + | ( | 2 | x | − | 15 | ) | × | 18 5 |
| = | 6 | x | − | 18 | + | 2 | x | × | 18 5 | − | 15 | × | 18 5 |
| = | 6 | x | − | 18 | + | 36 5 | x | − | 54 |
| = | 66 5 | x | − | 72 |
66 5 | x | − | 72 | = | 76 | × | 6 |
| 方程右边 = | 456 |
66 5 | x | − | 72 | = | 456 |
66 5 | x | = | 456 | + | 72 |
66 5 | x | = | 528 |
| x | = | 528 | ÷ | 66 5 |
| = | 528 | × | 5 66 |
| = | 8 | × | 5 |
| x | = | 40 |