30000 | + | x | − | ( | 30000 | + | x | ) | ÷ | 300 | × | 40 | = | 30000 |
方程左边 = | 30000 | + | x | − | ( | 30000 | + | x | ) | × | 2 15 |
30000 | + | x | − | ( | 30000 | + | x | ) | × | 2 15 | = | 30000 |
方程左边 = | 30000 | + | x | − | 30000 | × | 2 15 | − | x | × | 2 15 |
= | 30000 | + | x | − | 4000 | − | x | × | 2 15 |
= | 26000 | + | 13 15 | x |
26000 | + | 13 15 | x | = | 30000 |
13 15 | x | = | 30000 | − | 26000 |
13 15 | x | = | 4000 |
x | = | 4000 | ÷ | 13 15 |
= | 4000 | × | 15 13 |
x | = | 60000 13 |
x | = | 4615.384615 |