10000 | ( | x | + | 60 | ) | + | 30000 | x | = | 150 | x | ( | x | + | 60 | ) |
方程左边 = | 10000 | x | + | 10000 | × | 60 | + | 30000 | x |
= | 10000 | x | + | 600000 | + | 30000 | x |
= | 40000 | x | + | 600000 |
40000 | x | + | 600000 | = | 150 | x | ( | x | + | 60 | ) |
方程右边 = | 150 | x | x | + | 150 | x | × | 60 |
= | 150 | x | x | + | 9000 | x |
40000 | x | + | 600000 | = | 150 | x | x | + | 9000 | x |