| 91 | ÷ | ( | 19 | + | 2 | ( | 8 | x | + | 4 | ) | ) | + | 6 | = | 7 |
| 方程两边同时乘以: | ( | 19 | + | 2 | ( | 8 | x | + | 4 | ) | ) |
| 91 | + | 6 | ( | 19 | + | 2 | ( | 8 | x | + | 4 | ) | ) | = | 7 | ( | 19 | + | 2 | ( | 8 | x | + | 4 | ) | ) |
| 91 | + | 6 | × | 19 | + | 6 | × | 2 | ( | 8 | x | + | 4 | ) | = | 7 | ( | 19 | + | 2 | ( | 8 | x | + | 4 | ) | ) |
| 91 | + | 6 | × | 19 | + | 6 | × | 2 | ( | 8 | x | + | 4 | ) | = | 7 | × | 19 | + | 7 | × | 2 | ( | 8 | x | + | 4 | ) |
| 91 | + | 114 | + | 12 | ( | 8 | x | + | 4 | ) | = | 133 | + | 14 | ( | 8 | x | + | 4 | ) |
| 205 | + | 12 | ( | 8 | x | + | 4 | ) | = | 133 | + | 14 | ( | 8 | x | + | 4 | ) |
| 205 | + | 12 | × | 8 | x | + | 12 | × | 4 | = | 133 | + | 14 | ( | 8 | x | + | 4 | ) |
| 205 | + | 12 | × | 8 | x | + | 12 | × | 4 | = | 133 | + | 14 | × | 8 | x | + | 14 | × | 4 |
| 205 | + | 96 | x | + | 48 | = | 133 | + | 112 | x | + | 56 |
| 253 | + | 96 | x | = | 189 | + | 112 | x |
| 96 | x | − | 112 | x | = | 189 | − | 253 |
| - | 16 | x | = | 189 | − | 253 |
| - | 16 | x | = | - | 64 |
| 64 | = | 16 | x |
| 16 | x | = | 64 |
| x | = | 64 | ÷ | 16 |
| = | 64 | × | 1 16 |
| = | 4 | × | 1 |
| x | = | 4 |