| 243 | × | 119 25 | + | 5 | X | = | 243 | × | 24 5 | + | 24 5 | X |
| 方程左边 = | 28917 25 | + | 5 | X |
28917 25 | + | 5 | X | = | 243 | × | 24 5 | + | 24 5 | X |
| 方程右边 = | 5832 5 | + | 24 5 | X |
28917 25 | + | 5 | X | = | 5832 5 | + | 24 5 | X |
| 5 | X | − | 24 5 | X | = | 5832 5 | − | 28917 25 |
1 5 | X | = | 5832 5 | − | 28917 25 |
1 5 | X | = | 243 25 |
| X | = | 243 25 | ÷ | 1 5 |
| = | 243 25 | × | 5 |
| = | 243 5 | × | 1 |
| X | = | 243 5 |
| X | = | 48.6 |