| ( | X | − | 163720 | ) | ÷ | X | = | 11301687 20000000 |
| 方程两边同时乘以: | X |
| ( | X | − | 163720 | ) | = | 11301687 20000000 | X |
| X | − | 163720 | = | 11301687 20000000 | X |
| X | − | 11301687 20000000 | X | = | 163720 |
8698313 20000000 | X | = | 163720 |
| X | = | 163720 | ÷ | 8698313 20000000 |
| = | 163720 | × | 20000000 8698313 |
| X | = | 3274400000000 8698313 |
| ( | X | − | 163720 | ) | ÷ | X | = | 11101687 20000000 |
| 方程两边同时乘以: | X |
| ( | X | − | 163720 | ) | = | 11101687 20000000 | X |
| X | − | 163720 | = | 11101687 20000000 | X |
| X | − | 11101687 20000000 | X | = | 163720 |
8898313 20000000 | X | = | 163720 |
| X | = | 163720 | ÷ | 8898313 20000000 |
| = | 163720 | × | 20000000 8898313 |
| X | = | 3274400000000 8898313 |
| ( | X | − | 163720 | ) | ÷ | X | = | 10901687 20000000 |
| 方程两边同时乘以: | X |
| ( | X | − | 163720 | ) | = | 10901687 20000000 | X |
| X | − | 163720 | = | 10901687 20000000 | X |
| X | − | 10901687 20000000 | X | = | 163720 |
9098313 20000000 | X | = | 163720 |
| X | = | 163720 | ÷ | 9098313 20000000 |
| = | 163720 | × | 20000000 9098313 |
| X | = | 3274400000000 9098313 |