400 | ÷ | x | = | 900 | ÷ | ( | 100 | − | x | ) | − | 500 | − | 5 | x |
方程两边同时乘以: | x | , | ( | 100 | − | x | ) |
400 | ( | 100 | − | x | ) | = | 900 | x | − | 500 | x | ( | 100 | − | x | ) | − | 5 | x | x | ( | 100 | − | x | ) |
400 | × | 100 | − | 400 | x | = | 900 | x | − | 500 | x | ( | 100 | − | x | ) | − | 5 | x | x | ( | 100 | − | x | ) |
400 | × | 100 | − | 400 | x | = | 900 | x | − | 500 | x | × | 100 | + | 500 | x | x | − | 5 | x | x | ( | 100 | − | x | ) |
40000 | − | 400 | x | = | 900 | x | − | 50000 | x | + | 500 | x | x | − | 5 | x | x | ( | 100 | − | x | ) |
40000 | − | 400 | x | = | - | 49100 | x | + | 500 | x | x | − | 5 | x | x | ( | 100 | − | x | ) |
40000 | − | 400 | x | = | - | 49100 | x | + | 500 | x | x | − | 5 | x | x | × | 100 | + | 5 | x | x |
40000 | − | 400 | x | = | - | 49100 | x | + | 500 | x | x | − | 500 | x | x | + | 5 | x | x | x |