| ( | 2185 | + | x | ) | ÷ | ( | 2411 | + | x | ) | = | 91 100 |
| 方程两边同时乘以: | ( | 2411 | + | x | ) |
| ( | 2185 | + | x | ) | = | 91 100 | ( | 2411 | + | x | ) |
| 2185 | + | x | = | 91 100 | ( | 2411 | + | x | ) |
| 2185 | + | x | = | 91 100 | × | 2411 | + | 91 100 | x |
| 2185 | + | x | = | 219401 100 | + | 91 100 | x |
| x | − | 91 100 | x | = | 219401 100 | − | 2185 |
9 100 | x | = | 219401 100 | − | 2185 |
9 100 | x | = | 901 100 |
| x | = | 901 100 | ÷ | 9 100 |
| = | 901 100 | × | 100 9 |
| = | 901 | × | 1 9 |
| x | = | 901 9 |
| x | = | 100.111111 |