63 2000 | × | 63 2000 | x | ÷ | x | = | 121 200 |
| 方程两边同时乘以: | x |
63 2000 | × | 63 2000 | x | = | 121 200 | x |
63 2000 | × | 63 2000 | x | − | 121 200 | x | = | 0 |
3969 4000000 | x | − | 121 200 | x | = | 0 |
| - | 2416031 4000000 | x | = | 0 |
| - | 0 | = | 2416031 4000000 | x |
2416031 4000000 | x | = | - | 0 |
| x | = | - | 0 | ÷ | 2416031 4000000 |
| = | - | 0 | × | 4000000 2416031 |
| x | = | 0 |
| x | = | 0 |