| ( | x | + | 4 | ) | ÷ | ( | x | + | 91 | ) | = | 1 10 |
| 方程两边同时乘以: | ( | x | + | 91 | ) |
| ( | x | + | 4 | ) | = | 1 10 | ( | x | + | 91 | ) |
| x | + | 4 | = | 1 10 | ( | x | + | 91 | ) |
| x | + | 4 | = | 1 10 | x | + | 1 10 | × | 91 |
| x | + | 4 | = | 1 10 | x | + | 91 10 |
| x | − | 1 10 | x | = | 91 10 | − | 4 |
9 10 | x | = | 91 10 | − | 4 |
9 10 | x | = | 51 10 |
| x | = | 51 10 | ÷ | 9 10 |
| = | 51 10 | × | 10 9 |
| = | 17 | × | 1 3 |
| x | = | 17 3 |
| x | = | 5.666667 |