| ( | 432 | − | 252 | ) | ÷ | x | = | 252 | ÷ | ( | x | + | 20 | ) | × | 6 5 |
| 方程两边同时乘以: | x | , | ( | x | + | 20 | ) |
| ( | 432 | − | 252 | ) | ( | x | + | 20 | ) | = | 252 | × | 6 5 | x |
| 432 | ( | x | + | 20 | ) | − | 252 | ( | x | + | 20 | ) | = | 252 | × | 6 5 | x |
| 432 | ( | x | + | 20 | ) | − | 252 | ( | x | + | 20 | ) | = | 1512 5 | x |
| 432 | x | + | 432 | × | 20 | − | 252 | ( | x | + | 20 | ) | = | 1512 5 | x |
| 432 | x | + | 8640 | − | 252 | ( | x | + | 20 | ) | = | 1512 5 | x |
| 432 | x | + | 8640 | − | 252 | x | − | 252 | × | 20 | = | 1512 5 | x |
| 432 | x | + | 8640 | − | 252 | x | − | 5040 | = | 1512 5 | x |
| 180 | x | + | 3600 | = | 1512 5 | x |
| 180 | x | − | 1512 5 | x | = | - | 3600 |
| - | 612 5 | x | = | - | 3600 |
| 3600 | = | 612 5 | x |
612 5 | x | = | 3600 |
| x | = | 3600 | ÷ | 612 5 |
| = | 3600 | × | 5 612 |
| = | 100 | × | 5 17 |
| x | = | 500 17 |
| x | = | 29.411765 |