| ( | 12 | × | 417 100 | + | 5 | x | ) | ÷ | ( | 12 | + | x | ) | = | 9 2 |
| 方程两边同时乘以: | ( | 12 | + | x | ) |
| ( | 12 | × | 417 100 | + | 5 | x | ) | = | 9 2 | ( | 12 | + | x | ) |
| 12 | × | 417 100 | + | 5 | x | = | 9 2 | ( | 12 | + | x | ) |
| 12 | × | 417 100 | + | 5 | x | = | 9 2 | × | 12 | + | 9 2 | x |
1251 25 | + | 5 | x | = | 54 | + | 9 2 | x |
| 5 | x | − | 9 2 | x | = | 54 | − | 1251 25 |
1 2 | x | = | 54 | − | 1251 25 |
1 2 | x | = | 99 25 |
| x | = | 99 25 | ÷ | 1 2 |
| = | 99 25 | × | 2 |
| x | = | 198 25 |
| x | = | 7.92 |