100 | × | 6 | + | x | × | 75 | = | ( | 100 | + | x | ) | × | 25 |
方程左边 = | 600 | + | x | × | 75 |
600 | + | 75 | x | = | ( | 100 | + | x | ) | × | 25 |
方程右边 = | 100 | × | 25 | + | x | × | 25 |
= | 2500 | + | x | × | 25 |
600 | + | 75 | x | = | 2500 | + | 25 | x |
75 | x | − | 25 | x | = | 2500 | − | 600 |
50 | x | = | 2500 | − | 600 |
50 | x | = | 1900 |
x | = | 1900 | ÷ | 50 |
= | 1900 | × | 1 50 |
= | 38 | × | 1 |
x | = | 38 |