| 9 | ( | 5 | + | 6 | ( | 3 | + | 7 | x | ) | + | 3 | ) | + | 9 | = | 4 | ( | 6 | + | 8 | ( | 9 | + | 3 | x | ) | + | 8 | ) | + | 79 |
| 方程左边 = | 9 | × | 5 | + | 9 | × | 6 | ( | 3 | + | 7 | x | ) | + | 9 | × | 3 | + | 9 |
| = | 45 | + | 54 | ( | 3 | + | 7 | x | ) | + | 27 | + | 9 |
| = | 81 | + | 54 | ( | 3 | + | 7 | x | ) |
| = | 81 | + | 54 | × | 3 | + | 54 | × | 7 | x |
| = | 81 | + | 162 | + | 378 | x |
| = | 243 | + | 378 | x |
| 243 | + | 378 | x | = | 4 | ( | 6 | + | 8 | ( | 9 | + | 3 | x | ) | + | 8 | ) | + | 79 |
| 方程右边 = | 4 | × | 6 | + | 4 | × | 8 | ( | 9 | + | 3 | x | ) | + | 4 | × | 8 | + | 79 |
| = | 24 | + | 32 | ( | 9 | + | 3 | x | ) | + | 32 | + | 79 |
| = | 135 | + | 32 | ( | 9 | + | 3 | x | ) |
| = | 135 | + | 32 | × | 9 | + | 32 | × | 3 | x |
| = | 135 | + | 288 | + | 96 | x |
| = | 423 | + | 96 | x |
| 243 | + | 378 | x | = | 423 | + | 96 | x |
| 378 | x | − | 96 | x | = | 423 | − | 243 |
| 282 | x | = | 423 | − | 243 |
| 282 | x | = | 180 |
| x | = | 180 | ÷ | 282 |
| = | 180 | × | 1 282 |
| = | 30 | × | 1 47 |
| x | = | 30 47 |
| x | = | 0.638298 |