50000 | = | ( | 100 | − | x | ) | × | 1800 | − | 50000 |
方程右边 = | 100 | × | 1800 | − | x | × | 1800 | − | 50000 |
= | 180000 | − | x | × | 1800 | − | 50000 |
= | 130000 | − | 1800 | x |
50000 | = | 130000 | − | 1800 | x |
1800 | x | = | 130000 | − | 50000 |
1800 | x | = | 80000 |
x | = | 80000 | ÷ | 1800 |
= | 80000 | × | 1 1800 |
= | 400 | × | 1 9 |
x | = | 400 9 |
x | = | 44.444444 |