12 | ÷ | x | − | 12 | ÷ | ( | 4 | + | x | ) | = | 4 |
方程两边同时乘以: | x |
12 | − | 12 | ÷ | ( | 4 | + | x | ) | × | x | = | 4 | x |
方程两边同时乘以: | ( | 4 | + | x | ) |
12 | ( | 4 | + | x | ) | − | 12 | x | = | 4 | x | ( | 4 | + | x | ) |
12 | × | 4 | + | 12 | x | − | 12 | x | = | 4 | x | ( | 4 | + | x | ) |
12 | × | 4 | + | 12 | x | − | 12 | x | = | 4 | x | × | 4 | + | 4 | x | x |
48 | + | 12 | x | − | 12 | x | = | 16 | x | + | 4 | x | x |
48 | + | 0 | x | = | 16 | x | + | 4 | x | x |