| ( | 116 | + | X | ) | ÷ | ( | 123 | + | X | ) | = | 98 100 |
| 方程两边同时乘以: | ( | 123 | + | X | ) |
| ( | 116 | + | X | ) | = | 98 100 | ( | 123 | + | X | ) |
| 116 | + | X | = | 98 100 | ( | 123 | + | X | ) |
| 116 | + | X | = | 98 100 | × | 123 | + | 98 100 | X |
| 116 | + | X | = | 6027 50 | + | 98 100 | X |
| X | − | 98 100 | X | = | 6027 50 | − | 116 |
1 50 | X | = | 6027 50 | − | 116 |
1 50 | X | = | 227 50 |
| X | = | 227 50 | ÷ | 1 50 |
| = | 227 50 | × | 50 |
| = | 227 | × | 1 |
| X | = | 227 |