| ( | 75 | + | x | ) | × | 24 5 | = | 5 | x | + | 75 | × | 9 2 |
| 方程左边 = | 75 | × | 24 5 | + | x | × | 24 5 |
| = | 360 | + | x | × | 24 5 |
| 360 | + | 24 5 | x | = | 5 | x | + | 75 | × | 9 2 |
| 方程右边 = | 5 | x | + | 675 2 |
| 360 | + | 24 5 | x | = | 5 | x | + | 675 2 |
24 5 | x | − | 5 | x | = | 675 2 | − | 360 |
| - | 1 5 | x | = | 675 2 | − | 360 |
| - | 1 5 | x | = | - | 45 2 |
45 2 | = | 1 5 | x |
1 5 | x | = | 45 2 |
| x | = | 45 2 | ÷ | 1 5 |
| = | 45 2 | × | 5 |
| x | = | 225 2 |
| x | = | 112.5 |