| ( | 230 | × | 241 50 | + | x | × | 99 20 | ) | ÷ | ( | 230 | + | x | ) | = | 247 50 |
| 方程两边同时乘以: | ( | 230 | + | x | ) |
| ( | 230 | × | 241 50 | + | x | × | 99 20 | ) | = | 247 50 | ( | 230 | + | x | ) |
| 230 | × | 241 50 | + | x | × | 99 20 | = | 247 50 | ( | 230 | + | x | ) |
| 230 | × | 241 50 | + | x | × | 99 20 | = | 247 50 | × | 230 | + | 247 50 | x |
5543 5 | + | x | × | 99 20 | = | 5681 5 | + | 247 50 | x |
99 20 | x | − | 247 50 | x | = | 5681 5 | − | 5543 5 |
1 100 | x | = | 5681 5 | − | 5543 5 |
1 100 | x | = | 138 5 |
| x | = | 138 5 | ÷ | 1 100 |
| = | 138 5 | × | 100 |
| = | 138 | × | 20 |
| x | = | 2760 |