| ( | 9 | x | + | 300 | ) | ÷ | ( | 11 | x | + | 80 | ) | = | 60 | ÷ | 59 |
| 方程两边同时乘以: | ( | 11 | x | + | 80 | ) |
| ( | 9 | x | + | 300 | ) | = | 60 | ÷ | 59 | × | ( | 11 | x | + | 80 | ) |
| 9 | x | + | 300 | = | 60 | ÷ | 59 | × | ( | 11 | x | + | 80 | ) |
| 9 | x | + | 300 | = | 60 | ÷ | 59 | × | 11 | x | + | 60 | ÷ | 59 | × | 80 |
| 9 | x | + | 300 | = | 660 59 | x | + | 4800 59 |
| 9 | x | − | 660 59 | x | = | 4800 59 | − | 300 |
| - | 129 59 | x | = | 4800 59 | − | 300 |
| - | 129 59 | x | = | - | 12900 59 |
12900 59 | = | 129 59 | x |
129 59 | x | = | 12900 59 |
| x | = | 12900 59 | ÷ | 129 59 |
| = | 12900 59 | × | 59 129 |
| = | 100 | × | 1 |
| x | = | 100 |