| ( | 333 | × | 387 100 | + | X | × | 4 | ) | ÷ | ( | 333 | + | X | ) | = | 4 |
| 方程两边同时乘以: | ( | 333 | + | X | ) |
| ( | 333 | × | 387 100 | + | X | × | 4 | ) | = | 4 | ( | 333 | + | X | ) |
| 333 | × | 387 100 | + | X | × | 4 | = | 4 | ( | 333 | + | X | ) |
| 333 | × | 387 100 | + | X | × | 4 | = | 4 | × | 333 | + | 4 | X |
128871 100 | + | X | × | 4 | = | 1332 | + | 4 | X |
| 4 | X | − | 4 | X | = | 1332 | − | 128871 100 |
| 0 | X | = | 1332 | − | 128871 100 |
| 0 | X | = | 4329 100 |