| ( | 5 | ( | 2 | + | x | ) | + | ( | 1 | × | 1 | ) | ) | ÷ | ( | 50 | + | x | ) | = | 49 10 |
| 方程两边同时乘以: | ( | 50 | + | x | ) |
| ( | 5 | ( | 2 | + | x | ) | + | ( | 1 | × | 1 | ) | ) | = | 49 10 | ( | 50 | + | x | ) |
| 5 | ( | 2 | + | x | ) | + | ( | 1 | × | 1 | ) | = | 49 10 | ( | 50 | + | x | ) |
| 5 | ( | 2 | + | x | ) | + | ( | 1 | × | 1 | ) | = | 49 10 | × | 50 | + | 49 10 | x |
| 5 | ( | 2 | + | x | ) | + | ( | 1 | × | 1 | ) | = | 245 | + | 49 10 | x |
| 5 | × | 2 | + | 5 | x | + | ( | 1 | × | 1 | ) | = | 245 | + | 49 10 | x |
| 10 | + | 5 | x | + | ( | 1 | × | 1 | ) | = | 245 | + | 49 10 | x |
| 10 | + | 5 | x | + | 1 | × | 1 | = | 245 | + | 49 10 | x |
| 10 | + | 5 | x | + | 1 | = | 245 | + | 49 10 | x |
| 11 | + | 5 | x | = | 245 | + | 49 10 | x |
| 5 | x | − | 49 10 | x | = | 245 | − | 11 |
1 10 | x | = | 245 | − | 11 |
1 10 | x | = | 234 |
| x | = | 234 | ÷ | 1 10 |
| = | 234 | × | 10 |
| x | = | 2340 |