| ( | 2400 | × | 959 1000 | + | y | − | 2400 | ) | ÷ | y | = | 999 1000 |
| 方程两边同时乘以: | y |
| ( | 2400 | × | 959 1000 | + | y | − | 2400 | ) | = | 999 1000 | y |
| 2400 | × | 959 1000 | + | y | − | 2400 | = | 999 1000 | y |
11508 5 | + | y | − | 2400 | = | 999 1000 | y |
| - | 492 5 | + | y | = | 999 1000 | y |
| y | − | 999 1000 | y | = | 492 5 |
1 1000 | y | = | 492 5 |
| y | = | 492 5 | ÷ | 1 1000 |
| = | 492 5 | × | 1000 |
| = | 492 | × | 200 |
| y | = | 98400 |