| 10 | ( | 275 | + | 2200 | ÷ | 21 | + | ( | 8 | ÷ | 21 | × | y | ) | ) | = | 19 | y |
| 方程左边 = | 10 | × | 275 | + | 10 | × | 2200 | ÷ | 21 | + | 10 | ( | 8 | ÷ | 21 | × | y | ) |
| = | 2750 | + | 22000 21 | + | 10 | ( | 8 | ÷ | 21 | × | y | ) |
| = | 79750 21 | + | 10 | ( | 8 | ÷ | 21 | × | y | ) |
| = | 79750 21 | + | 10 | × | 8 | ÷ | 21 | × | y |
| = | 79750 21 | + | 80 21 | y |
79750 21 | + | 80 21 | y | = | 19 | y |
80 21 | y | − | 19 | y | = | - | 79750 21 |
| - | 319 21 | y | = | - | 79750 21 |
79750 21 | = | 319 21 | y |
319 21 | y | = | 79750 21 |
| y | = | 79750 21 | ÷ | 319 21 |
| = | 79750 21 | × | 21 319 |
| = | 250 | × | 1 |
| y | = | 250 |