240 | ÷ | x | = | ( | 200 | ÷ | ( | x | − | 4 | ) | ) | − | 5 |
方程两边同时乘以: | x |
240 | = | ( | 200 | ÷ | ( | x | − | 4 | ) | ) | x | − | 5 | x |
240 | = | 200 | ÷ | ( | x | − | 4 | ) | × | x | − | 5 | x |
方程两边同时乘以: | ( | x | − | 4 | ) |
240 | ( | x | − | 4 | ) | = | 200 | x | − | 5 | x | ( | x | − | 4 | ) |
240 | x | − | 240 | × | 4 | = | 200 | x | − | 5 | x | ( | x | − | 4 | ) |
240 | x | − | 240 | × | 4 | = | 200 | x | − | 5 | x | x | + | 5 | x | × | 4 |
240 | x | − | 960 | = | 200 | x | − | 5 | x | x | + | 20 | x |
240 | x | − | 960 | = | 220 | x | − | 5 | x | x |