| 420 | ÷ | x | − | 420 | ÷ | ( | 1 | + | 50 100 | ) | = | 2 |
| 方程两边同时乘以: | x |
| 420 | − | 420 | ÷ | ( | 1 | + | 50 100 | ) | × | x | = | 2 | x |
| 方程两边同时乘以: | ( | 1 | + | 50 100 | ) |
| 420 | ( | 1 | + | 50 100 | ) | − | 420 | x | = | 2 | x | ( | 1 | + | 50 100 | ) |
| 420 | × | 1 | + | 420 | × | 50 100 | − | 420 | x | = | 2 | x | ( | 1 | + | 50 100 | ) |
| 420 | × | 1 | + | 420 | × | 50 100 | − | 420 | x | = | 2 | x | × | 1 | + | 2 | x | × | 50 100 |
| 420 | + | 210 | − | 420 | x | = | 2 | x | + | 1 | x |
| 630 | − | 420 | x | = | 3 | x |
| - | 420 | x | − | 3 | x | = | - | 630 |
| - | 423 | x | = | - | 630 |
| 630 | = | 423 | x |
| 423 | x | = | 630 |
| x | = | 630 | ÷ | 423 |
| = | 630 | × | 1 423 |
| = | 70 | × | 1 47 |
| x | = | 70 47 |
| x | = | 1.489362 |