4500 | = | ( | X | − | 25 | ) | × | 400 | + | 5000 |
方程右边 = | X | × | 400 | − | 25 | × | 400 | + | 5000 |
= | X | × | 400 | − | 10000 | + | 5000 |
= | 400 | X | − | 5000 |
4500 | = | 400 | X | − | 5000 |
- | 400 | X | = | - | 5000 | − | 4500 |
- | 400 | X | = | - | 9500 |
9500 | = | 400 | X |
400 | X | = | 9500 |
X | = | 9500 | ÷ | 400 |
= | 9500 | × | 1 400 |
= | 95 | × | 1 4 |
X | = | 95 4 |
X | = | 23.75 |