4 5 | x | + | 31 10 | = | 87 10 | + | 2 5 | x |
4 5 | x | − | 2 5 | x | = | 87 10 | − | 31 10 |
2 5 | x | = | 87 10 | − | 31 10 |
2 5 | x | = | 28 5 |
| x | = | 28 5 | ÷ | 2 5 |
| = | 28 5 | × | 5 2 |
| = | 14 | × | 1 |
| x | = | 14 |
9 10 | x | + | 23 10 | = | 73 10 | + | 2 5 | x |
9 10 | x | − | 2 5 | x | = | 73 10 | − | 23 10 |
1 2 | x | = | 73 10 | − | 23 10 |
1 2 | x | = | 5 |
| x | = | 5 | ÷ | 1 2 |
| = | 5 | × | 2 |
| x | = | 10 |
| 3 | ( | x | + | 21 10 | ) | = | 21 2 |
| 方程左边 = | 3 | x | + | 3 | × | 21 10 |
| = | 3 | x | + | 63 10 |
| 3 | x | + | 63 10 | = | 21 2 |
| 3 | x | = | 21 2 | − | 63 10 |
| 3 | x | = | 21 5 |
| x | = | 21 5 | ÷ | 3 |
| = | 21 5 | × | 1 3 |
| = | 7 5 | × | 1 |
| x | = | 7 5 |
| x | = | 1.4 |
2 5 | x | + | 1 10 | x | + | 19 10 | = | 49 10 |
| 方程左边 = | 1 2 | x | + | 19 10 |
1 2 | x | + | 19 10 | = | 49 10 |
1 2 | x | = | 49 10 | − | 19 10 |
1 2 | x | = | 3 |
| x | = | 3 | ÷ | 1 2 |
| = | 3 | × | 2 |
| x | = | 6 |
4 5 | x | − | 39 10 | = | 13 10 | + | 2 5 | x |
4 5 | x | − | 2 5 | x | = | 13 10 | + | 39 10 |
2 5 | x | = | 13 10 | + | 39 10 |
2 5 | x | = | 26 5 |
| x | = | 26 5 | ÷ | 2 5 |
| = | 26 5 | × | 5 2 |
| = | 13 | × | 1 |
| x | = | 13 |
| ( | x | − | 1 2 | ) | ÷ | 1 5 | = | 10 |
| 方程左边 = | x | × | 5 | − | 1 2 | × | 5 |
| = | x | × | 5 | − | 5 2 |
| 5 | x | − | 5 2 | = | 10 |
| 5 | x | = | 10 | + | 5 2 |
| 5 | x | = | 25 2 |
| x | = | 25 2 | ÷ | 5 |
| = | 25 2 | × | 1 5 |
| = | 5 2 | × | 1 |
| x | = | 5 2 |
| x | = | 2.5 |