x | × | 4 5 | + | ( | 5000 | − | x | ) | × | 21 100 | = | 5000 | × | 7 20 |
方程左边 = | 4 5 | x | + | 5000 | × | 21 100 | − | x | × | 21 100 |
= | 4 5 | x | + | 1050 | − | x | × | 21 100 |
= | 59 100 | x | + | 1050 |
59 100 | x | + | 1050 | = | 5000 | × | 7 20 |
方程右边 = | 1750 |
59 100 | x | + | 1050 | = | 1750 |
59 100 | x | = | 1750 | − | 1050 |
59 100 | x | = | 700 |
x | = | 700 | ÷ | 59 100 |
= | 700 | × | 100 59 |
x | = | 70000 59 |
x | = | 1186.440678 |