( | X | − | 860 | ) | ÷ | 3000 | = | ( | X | − | 500 | ) | ÷ | 4000 |
方程左边 = | X | × | 1 3000 | − | 860 | × | 1 3000 |
= | X | × | 1 3000 | − | 43 150 |
1 3000 | X | − | 43 150 | = | ( | X | − | 500 | ) | ÷ | 4000 |
方程右边 = | X | × | 1 4000 | − | 500 | × | 1 4000 |
= | X | × | 1 4000 | − | 1 8 |
1 3000 | X | − | 43 150 | = | 1 4000 | X | − | 1 8 |
1 3000 | X | − | 1 4000 | X | = | - | 1 8 | + | 43 150 |
1 12000 | X | = | - | 1 8 | + | 43 150 |
1 12000 | X | = | 97 600 |
X | = | 97 600 | ÷ | 1 12000 |
= | 97 600 | × | 12000 |
= | 97 | × | 20 |
X | = | 1940 |