| ( | X | − | 163720 | ) | ÷ | X | = | 1 2 |
| 方程两边同时乘以: | X |
| ( | X | − | 163720 | ) | = | 1 2 | X |
| X | − | 163720 | = | 1 2 | X |
| X | − | 1 2 | X | = | 163720 |
1 2 | X | = | 163720 |
| X | = | 163720 | ÷ | 1 2 |
| = | 163720 | × | 2 |
| X | = | 327440 |
| ( | X | − | 207260 | ) | ÷ | X | = | 1 2 |
| 方程两边同时乘以: | X |
| ( | X | − | 207260 | ) | = | 1 2 | X |
| X | − | 207260 | = | 1 2 | X |
| X | − | 1 2 | X | = | 207260 |
1 2 | X | = | 207260 |
| X | = | 207260 | ÷ | 1 2 |
| = | 207260 | × | 2 |
| X | = | 414520 |
| ( | X | − | 304220 | ) | ÷ | X | = | 1 2 |
| 方程两边同时乘以: | X |
| ( | X | − | 304220 | ) | = | 1 2 | X |
| X | − | 304220 | = | 1 2 | X |
| X | − | 1 2 | X | = | 304220 |
1 2 | X | = | 304220 |
| X | = | 304220 | ÷ | 1 2 |
| = | 304220 | × | 2 |
| X | = | 608440 |
| ( | X | − | 219840 | ) | ÷ | X | = | 1 2 |
| 方程两边同时乘以: | X |
| ( | X | − | 219840 | ) | = | 1 2 | X |
| X | − | 219840 | = | 1 2 | X |
| X | − | 1 2 | X | = | 219840 |
1 2 | X | = | 219840 |
| X | = | 219840 | ÷ | 1 2 |
| = | 219840 | × | 2 |
| X | = | 439680 |
| ( | X | − | 258940 | ) | ÷ | X | = | 1 2 |
| 方程两边同时乘以: | X |
| ( | X | − | 258940 | ) | = | 1 2 | X |
| X | − | 258940 | = | 1 2 | X |
| X | − | 1 2 | X | = | 258940 |
1 2 | X | = | 258940 |
| X | = | 258940 | ÷ | 1 2 |
| = | 258940 | × | 2 |
| X | = | 517880 |