| ( | x | − | ( | 18 | + | 1 10 | x | ) | ) | ÷ | x | = | 10 100 |
| 方程两边同时乘以: | x |
| ( | x | − | ( | 18 | + | 1 10 | x | ) | ) | = | 10 100 | x |
| x | − | ( | 18 | + | 1 10 | x | ) | = | 10 100 | x |
| x | − | 18 | − | 1 10 | x | = | 10 100 | x |
9 10 | x | − | 18 | = | 10 100 | x |
9 10 | x | − | 10 100 | x | = | 18 |
4 5 | x | = | 18 |
| x | = | 18 | ÷ | 4 5 |
| = | 18 | × | 5 4 |
| = | 9 | × | 5 2 |
| x | = | 45 2 |
| x | = | 22.5 |