18000 | X | × | 5 | + | 18000 | X | × | 4 | + | 18000 | X | × | 3 | − | 4000 | = | 70000 |
方程左边 = | 90000 | X | + | 72000 | X | + | 54000 | X | − | 4000 |
= | 216000 | X | − | 4000 |
216000 | X | − | 4000 | = | 70000 |
216000 | X | = | 70000 | + | 4000 |
216000 | X | = | 74000 |
X | = | 74000 | ÷ | 216000 |
= | 74000 | × | 1 216000 |
= | 37 | × | 1 108 |
X | = | 37 108 |
X | = | 0.342593 |