| ( | ( | x | − | 7 10 | ) | ÷ | ( | 13 10 | − | 7 10 | ) | × | 4 | − | 2 | ) | × | 1 2 | = | 5 |
| ( | x | − | 7 10 | ) | ÷ | ( | 13 10 | − | 7 10 | ) | × | 4 | × | 1 2 | − | 2 | × | 1 2 | = | 5 |
| ( | x | − | 7 10 | ) | ÷ | ( | 13 10 | − | 7 10 | ) | × | 2 | − | 1 | = | 5 |
| 方程两边同时乘以: | ( | 13 10 | − | 7 10 | ) |
| ( | x | − | 7 10 | ) | × | 2 | − | 1 | ( | 13 10 | − | 7 10 | ) | = | 5 | ( | 13 10 | − | 7 10 | ) |
| x | × | 2 | − | 7 10 | × | 2 | − | 1 | ( | 13 10 | − | 7 10 | ) | = | 5 | ( | 13 10 | − | 7 10 | ) |
| x | × | 2 | − | 7 10 | × | 2 | − | 1 | ( | 13 10 | − | 7 10 | ) | = | 5 | × | 13 10 | − | 5 | × | 7 10 |
| x | × | 2 | − | 7 5 | − | 1 | ( | 13 10 | − | 7 10 | ) | = | 13 2 | − | 7 2 |
| 2 | x | − | 7 5 | − | 1 | ( | 13 10 | − | 7 10 | ) | = | 3 |
| 2 | x | − | 7 5 | − | 1 | × | 13 10 | + | 1 | × | 7 10 | = | 3 |
| 2 | x | − | 7 5 | − | 13 10 | + | 7 10 | = | 3 |
| 2 | x | − | 2 | = | 3 |
| 2 | x | = | 3 | + | 2 |
| 2 | x | = | 5 |
| x | = | 5 | ÷ | 2 |
| = | 5 | × | 1 2 |
| x | = | 5 2 |
| x | = | 2.5 |