| ( | 45 | + | 8 | x | ) | ÷ | ( | 6 | + | x | ) | = | 77 10 |
| 方程两边同时乘以: | ( | 6 | + | x | ) |
| ( | 45 | + | 8 | x | ) | = | 77 10 | ( | 6 | + | x | ) |
| 45 | + | 8 | x | = | 77 10 | ( | 6 | + | x | ) |
| 45 | + | 8 | x | = | 77 10 | × | 6 | + | 77 10 | x |
| 45 | + | 8 | x | = | 231 5 | + | 77 10 | x |
| 8 | x | − | 77 10 | x | = | 231 5 | − | 45 |
3 10 | x | = | 231 5 | − | 45 |
3 10 | x | = | 6 5 |
| x | = | 6 5 | ÷ | 3 10 |
| = | 6 5 | × | 10 3 |
| = | 2 | × | 2 |
| x | = | 4 |