| 168 | ÷ | 342 | ÷ | ( | 42 25 | ÷ | 342 | + | 20 | ÷ | 18 | + | n | ) | = | 245 | ÷ | 690 | ÷ | ( | 49 20 | ÷ | 690 | + | 20 | ÷ | 18 | − | n | ) |
| 方程两边同时乘以: | ( | 42 25 | ÷ | 342 | + | 20 | ÷ | 18 | + | n | ) | , | ( | 49 20 | ÷ | 690 | + | 20 | ÷ | 18 | − | n | ) |
| 168 | ÷ | 342 | × | ( | 49 20 | ÷ | 690 | + | 20 | ÷ | 18 | − | n | ) | = | 245 | ÷ | 690 | × | ( | 42 25 | ÷ | 342 | + | 20 | ÷ | 18 | + | n | ) |
| 168 | ÷ | 342 | × | 49 20 | ÷ | 690 | + | 168 | ÷ | 342 | × | 20 | ÷ | 18 | − | 168 | ÷ | 342 | × | n | = | 245 | ÷ | 690 | × | ( | 42 25 | ÷ | 342 | + | 20 | ÷ | 18 | + | n | ) |
| 168 | ÷ | 342 | × | 49 20 | ÷ | 690 | + | 168 | ÷ | 342 | × | 20 | ÷ | 18 | − | 168 | ÷ | 342 | × | n | = | 245 | ÷ | 690 | × | 42 25 | ÷ | 342 | + | 245 | ÷ | 690 | × | 20 | ÷ | 18 | + | 245 | ÷ | 690 | × | n |
343 196650 | + | 280 513 | − | 28 57 | n | = | 343 196650 | + | 245 621 | + | 49 138 | n |
323029 589950 | − | 28 57 | n | = | 233779 589950 | + | 49 138 | n |
| - | 28 57 | n | − | 49 138 | n | = | 233779 589950 | − | 323029 589950 |
| - | 2219 2622 | n | = | 233779 589950 | − | 323029 589950 |
| - | 2219 2622 | n | = | - | 595 3933 |
595 3933 | = | 2219 2622 | n |
2219 2622 | n | = | 595 3933 |
| n | = | 595 3933 | ÷ | 2219 2622 |
| = | 595 3933 | × | 2622 2219 |
| = | 85 3 | × | 2 317 |
| n | = | 170 951 |
| n | = | 0.178759 |