| 0 | = | 3 5 | − | 1 5 | − | ( | ( | 1 | + | X | ) | ÷ | X | ) | × | 1 20 | ( | 1 | − | 3 10 | ) |
| 0 | = | 3 5 | − | 1 5 | − | ( | 1 | + | X | ) | ÷ | X | × | 1 20 | ( | 1 | − | 3 10 | ) |
| 0 | = | 2 5 | − | ( | 1 | + | X | ) | ÷ | X | × | 1 20 | ( | 1 | − | 3 10 | ) |
| 方程两边同时乘以: | X |
| 0 | = | 2 5 | X | − | ( | 1 | + | X | ) | × | 1 20 | ( | 1 | − | 3 10 | ) |
| 0 | = | 2 5 | X | − | 1 | × | 1 20 | ( | 1 | − | 3 10 | ) | − | X | × | 1 20 | ( | 1 | − | 3 10 | ) |
| 0 | = | 2 5 | X | − | 1 20 | ( | 1 | − | 3 10 | ) | − | X | × | 1 20 | ( | 1 | − | 3 10 | ) |
| 0 | = | 2 5 | X | − | 1 20 | × | 1 | + | 1 20 | × | 3 10 | − | X | × | 1 20 | ( | 1 | − | 3 10 | ) |
| 0 | = | 2 5 | X | − | 1 20 | + | 3 200 | − | X | × | 1 20 | ( | 1 | − | 3 10 | ) |
| 0 | = | 2 5 | X | − | 7 200 | − | X | × | 1 20 | ( | 1 | − | 3 10 | ) |
| 0 | = | 2 5 | X | − | 7 200 | − | X | × | 1 20 | × | 1 | + | X | × | 1 20 | × | 3 10 |
| 0 | = | 2 5 | X | − | 7 200 | − | X | × | 1 20 | + | X | × | 3 200 |
| 0 | = | 73 200 | X | − | 7 200 |
| - | 73 200 | X | = | - | 7 200 | − | 0 |
| - | 73 200 | X | = | - | 7 200 |
7 200 | = | 73 200 | X |
73 200 | X | = | 7 200 |
| X | = | 7 200 | ÷ | 73 200 |
| = | 7 200 | × | 200 73 |
| = | 7 | × | 1 73 |
| X | = | 7 73 |
| X | = | 0.09589 |