| 3 | ÷ | ( | 5 | + | m | ) | + | 3 | ÷ | ( | m | + | 7 | ) | = | 6 | ÷ | ( | m | + | 6 | ) |
| 方程两边同时乘以: | ( | 5 | + | m | ) | , | ( | m | + | 6 | ) |
| 3 | ( | m | + | 6 | ) | + | 3 | ÷ | ( | m | + | 7 | ) | × | ( | 5 | + | m | ) | ( | m | + | 6 | ) | = | 6 | ( | 5 | + | m | ) |
| 3 | m | + | 3 | × | 6 | + | 3 | ÷ | ( | m | + | 7 | ) | × | ( | 5 | + | m | ) | ( | m | + | 6 | ) | = | 6 | ( | 5 | + | m | ) |
| 3 | m | + | 3 | × | 6 | + | 3 | ÷ | ( | m | + | 7 | ) | × | ( | 5 | + | m | ) | ( | m | + | 6 | ) | = | 6 | × | 5 | + | 6 | m |
| 3 | m | + | 18 | + | 3 | ÷ | ( | m | + | 7 | ) | × | ( | 5 | + | m | ) | ( | m | + | 6 | ) | = | 30 | + | 6 | m |
| 方程两边同时乘以: | ( | m | + | 7 | ) |
| 3 | m | ( | m | + | 7 | ) | + | 18 | ( | m | + | 7 | ) | + | 3 | ( | 5 | + | m | ) | ( | m | + | 6 | ) | = | 30 | ( | m | + | 7 | ) | + | 6 | m | ( | m | + | 7 | ) |
| 3 | m | m | + | 3 | m | × | 7 | + | 18 | ( | m | + | 7 | ) | + | 3 | ( | 5 | + | m | ) | ( | m | + | 6 | ) | = | 30 | ( | m | + | 7 | ) | + | 6 | m | ( | m | + | 7 | ) |
| 3 | m | m | + | 3 | m | × | 7 | + | 18 | ( | m | + | 7 | ) | + | 3 | ( | 5 | + | m | ) | ( | m | + | 6 | ) | = | 30 | m | + | 30 | × | 7 | + | 6 | m | ( | m | + | 7 | ) |
| 3 | m | m | + | 21 | m | + | 18 | ( | m | + | 7 | ) | + | 3 | ( | 5 | + | m | ) | ( | m | + | 6 | ) | = | 30 | m | + | 210 | + | 6 | m | ( | m | + | 7 | ) |
| 3 | m | m | + | 21 | m | + | 18 | m | + | 18 | × | 7 | + | 3 | ( | 5 | + | m | ) | ( | m | + | 6 | ) | = | 30 | m | + | 210 | + | 6 | m | ( | m | + | 7 | ) |
| 3 | m | m | + | 21 | m | + | 18 | m | + | 18 | × | 7 | + | 3 | ( | 5 | + | m | ) | ( | m | + | 6 | ) | = | 30 | m | + | 210 | + | 6 | m | m | + | 6 | m | × | 7 |
| 3 | m | m | + | 21 | m | + | 18 | m | + | 126 | + | 3 | ( | 5 | + | m | ) | ( | m | + | 6 | ) | = | 30 | m | + | 210 | + | 6 | m | m | + | 42 | m |
| 3 | m | m | + | 39 | m | + | 126 | + | 3 | ( | 5 | + | m | ) | ( | m | + | 6 | ) | = | 72 | m | + | 210 | + | 6 | m | m |
| 3 | m | m | + | 39 | m | + | 126 | + | 3 | × | 5 | ( | m | + | 6 | ) | + | 3 | m | ( | m | + | 6 | ) | = | 72 | m | + | 210 | + | 6 | m | m |
| 3 | m | m | + | 39 | m | + | 126 | + | 15 | ( | m | + | 6 | ) | + | 3 | m | ( | m | + | 6 | ) | = | 72 | m | + | 210 | + | 6 | m | m |
| 3 | m | m | + | 39 | m | + | 126 | + | 15 | m | + | 15 | × | 6 | + | 3 | m | = | 72 | m | + | 210 | + | 6 | m | m |
| 3 | m | m | + | 39 | m | + | 126 | + | 15 | m | + | 90 | + | 3 | m | ( | m | + | 6 | ) | = | 72 | m | + | 210 | + | 6 | m | m |
| 3 | m | m | + | 54 | m | + | 216 | + | 3 | m | ( | m | + | 6 | ) | = | 72 | m | + | 210 | + | 6 | m | m |
| 3 | m | m | + | 54 | m | + | 216 | + | 3 | m | m | + | 3 | m | × | 6 | = | 72 | m | + | 210 | + | 6 | m | m |
| 3 | m | m | + | 54 | m | + | 216 | + | 3 | m | m | + | 18 | m | = | 72 | m | + | 210 | + | 6 | m | m |
| 3 | m | m | + | 72 | m | + | 216 | + | 3 | m | m | = | 72 | m | + | 210 | + | 6 | m | m |