| ( | X | + | 3 2 | ) | × | 6 5 | ( | 1 2 | ÷ | X | ) | = | 79 100 |
| X | × | 6 5 | ( | 1 2 | ÷ | X | ) | + | 3 2 | × | 6 5 | ( | 1 2 | ÷ | X | ) | = | 79 100 |
| X | × | 6 5 | ( | 1 2 | ÷ | X | ) | + | 9 5 | ( | 1 2 | ÷ | X | ) | = | 79 100 |
| 1 | × | 6 5 | × | 1 2 | ÷ | 1 | + | 9 5 | ( | 1 2 | ÷ | X | ) | = | 79 100 |
3 5 | + | 9 5 | ( | 1 2 | ÷ | X | ) | = | 79 100 |
3 5 | + | 9 5 | × | 1 2 | ÷ | X | = | 79 100 |
3 5 | + | 9 10 | ÷ | X | = | 79 100 |
| 方程两边同时乘以: | X |
3 5 | X | + | 9 10 | = | 79 100 | X |
3 5 | X | − | 79 100 | X | = | - | 9 10 |
| - | 19 100 | X | = | - | 9 10 |
9 10 | = | 19 100 | X |
19 100 | X | = | 9 10 |
| X | = | 9 10 | ÷ | 19 100 |
| = | 9 10 | × | 100 19 |
| = | 9 | × | 10 19 |
| X | = | 90 19 |
| X | = | 4.736842 |