| ( | 2 25 | − | X | ) | ÷ | ( | 2 25 | − | 1 10 | ) | = | ( | 50 | − | 0 | ) | ÷ | ( | 50 | + | 20 | ) |
| 方程两边同时乘以: | ( | 2 25 | − | 1 10 | ) | , | ( | 50 | + | 20 | ) |
| ( | 2 25 | − | X | ) | ( | 50 | + | 20 | ) | = | ( | 50 | − | 0 | ) | ( | 2 25 | − | 1 10 | ) |
2 25 | ( | 50 | + | 20 | ) | − | X | ( | 50 | + | 20 | ) | = | ( | 50 | − | 0 | ) | ( | 2 25 | − | 1 10 | ) |
2 25 | ( | 50 | + | 20 | ) | − | X | ( | 50 | + | 20 | ) | = | 50 | ( | 2 25 | − | 1 10 | ) | − | 0 | ( | 2 25 | − | 1 10 | ) |
2 25 | × | 50 | + | 2 25 | × | 20 | − | X | ( | 50 | + | 20 | ) | = | 50 | ( | 2 25 | − | 1 10 | ) | − | 0 | ( | 2 25 | − | 1 10 | ) |
2 25 | × | 50 | + | 2 25 | × | 20 | − | X | ( | 50 | + | 20 | ) | = | 50 | × | 2 25 | − | 50 | × | 1 10 | − | 0 | ( | 2 25 | − | 1 10 | ) |
| 4 | + | 8 5 | − | X | ( | 50 | + | 20 | ) | = | 4 | − | 5 | − | 0 | ( | 2 25 | − | 1 10 | ) |
28 5 | − | X | ( | 50 | + | 20 | ) | = | - | 1 | − | 0 | ( | 2 25 | − | 1 10 | ) |
28 5 | − | X | × | 50 | − | X | × | 20 | = | - | 1 |
28 5 | − | 70 | X | = | - | 1 |
| - | 70 | X | = | - | 1 | − | 28 5 |
| - | 70 | X | = | - | 33 5 |
33 5 | = | 70 | X |
| 70 | X | = | 33 5 |
| X | = | 33 5 | ÷ | 70 |
| = | 33 5 | × | 1 70 |
| X | = | 33 350 |
| X | = | 0.094286 |