( | 140 | + | x | ) | ( | 60 | − | x | ÷ | 10 | ) | = | 14000 |
方程左边 = | 140 | ( | 60 | − | x | ÷ | 10 | ) | + | x | ( | 60 | − | x | ÷ | 10 | ) |
= | 140 | × | 60 | − | 140 | x | ÷ | 10 | + | x | ( | 60 | − | x | ÷ | 10 | ) |
= | 8400 | − | 14 | x | + | x | ( | 60 | − | x | ÷ | 10 | ) |
= | 8400 | − | 14 | x | + | x | × | 60 | − | x | x | ÷ | 10 |
= | 8400 | + | 46 | x | − | x | x | × | 1 10 |
8400 | + | 46 | x | − | x | x | × | 1 10 | = | 14000 |