3 | x | − | 91 | = | 1 | ÷ | 3 | × | ( | 91 | − | x | ) | − | x |
方程右边 = | 1 3 | ( | 91 | − | x | ) | − | x |
3 | x | − | 91 | = | 1 3 | ( | 91 | − | x | ) | − | x |
方程右边 = | 1 3 | × | 91 | − | 1 3 | x | − | x |
= | 91 3 | − | 1 3 | x | − | x |
= | 91 3 | − | 4 3 | x |
3 | x | − | 91 | = | 91 3 | − | 4 3 | x |
3 | x | + | 4 3 | x | = | 91 3 | + | 91 |
13 3 | x | = | 91 3 | + | 91 |
13 3 | x | = | 364 3 |
x | = | 364 3 | ÷ | 13 3 |
= | 364 3 | × | 3 13 |
= | 28 | × | 1 |
x | = | 28 |