| ( | 5 | ( | 51 | + | x | ) | + | 4 | × | 4 | + | 1 | × | 7 | + | 3 | × | 1 | + | 2 | × | 2 | ) | ÷ | ( | 65 | + | x | ) | = | 23 5 |
| 方程两边同时乘以: | ( | 65 | + | x | ) |
| ( | 5 | ( | 51 | + | x | ) | + | 4 | × | 4 | + | 1 | × | 7 | + | 3 | × | 1 | + | 2 | × | 2 | ) | = | 23 5 | ( | 65 | + | x | ) |
| 5 | ( | 51 | + | x | ) | + | 4 | × | 4 | + | 1 | × | 7 | + | 3 | × | 1 | + | 2 | × | 2 | = | 23 5 | ( | 65 | + | x | ) |
| 5 | ( | 51 | + | x | ) | + | 4 | × | 4 | + | 1 | × | 7 | + | 3 | × | 1 | + | 2 | × | 2 | = | 23 5 | × | 65 | + | 23 5 | x |
| 5 | ( | 51 | + | x | ) | + | 16 | + | 7 | + | 3 | + | 4 | = | 299 | + | 23 5 | x |
| 5 | ( | 51 | + | x | ) | + | 30 | = | 299 | + | 23 5 | x |
| 5 | × | 51 | + | 5 | x | + | 30 | = | 299 | + | 23 5 | x |
| 255 | + | 5 | x | + | 30 | = | 299 | + | 23 5 | x |
| 285 | + | 5 | x | = | 299 | + | 23 5 | x |
| 5 | x | − | 23 5 | x | = | 299 | − | 285 |
2 5 | x | = | 299 | − | 285 |
2 5 | x | = | 14 |
| x | = | 14 | ÷ | 2 5 |
| = | 14 | × | 5 2 |
| = | 7 | × | 5 |
| x | = | 35 |