| ( | 24 | × | 56 | ÷ | y | ) | + | 7 | = | ( | 24 | × | 56 | ) | ÷ | ( | 3 | ÷ | 4 | × | y | ) |
| 方程两边同时乘以: | ( | 3 | ÷ | 4 | × | y | ) |
| ( | 24 | × | 56 | ÷ | y | ) | ( | 3 | ÷ | 4 | × | y | ) | + | 7 | ( | 3 | ÷ | 4 | × | y | ) | = | ( | 24 | × | 56 | ) |
| 24 | × | 56 | ÷ | y | × | ( | 3 | ÷ | 4 | × | y | ) | + | 7 | ( | 3 | ÷ | 4 | × | y | ) | = | ( | 24 | × | 56 | ) |
| 24 | × | 56 | ÷ | y | × | ( | 3 | ÷ | 4 | × | y | ) | + | 7 | ( | 3 | ÷ | 4 | × | y | ) | = | 24 | × | 56 |
| 1344 | ÷ | y | × | ( | 3 | ÷ | 4 | × | y | ) | + | 7 | ( | 3 | ÷ | 4 | × | y | ) | = | 1344 |
| 1344 | ÷ | 1 | × | 3 | ÷ | 4 | × | 1 | + | 7 | ( | 3 | ÷ | 4 | × | y | ) | = | 1344 |
| 1008 | + | 7 | ( | 3 | ÷ | 4 | × | y | ) | = | 1344 |
| 1008 | + | 7 | × | 3 | ÷ | 4 | × | y | = | 1344 |
| 1008 | + | 21 4 | y | = | 1344 |
21 4 | y | = | 1344 | − | 1008 |
21 4 | y | = | 336 |
| y | = | 336 | ÷ | 21 4 |
| = | 336 | × | 4 21 |
| = | 16 | × | 4 |
| y | = | 64 |