| ( | 4 | ( | y | + | 88 | ) | ) | ÷ | 5 | − | ( | 7 | y | ) | ÷ | ( | 10 | ) | = | 100 |
| 方程两边同时乘以: | ( | 10 | ) |
| ( | 4 | ( | y | + | 88 | ) | ) | ÷ | 5 | × | ( | 10 | ) | − | ( | 7 | y | ) | = | 100 | ( | 10 | ) |
| 4 | ( | y | + | 88 | ) | ÷ | 5 | × | ( | 10 | ) | − | ( | 7 | y | ) | = | 100 | ( | 10 | ) |
| 4 | ( | y | + | 88 | ) | ÷ | 5 | × | ( | 10 | ) | − | ( | 7 | y | ) | = | 100 | × | 10 |
4 5 | ( | y | + | 88 | ) | ( | 10 | ) | − | ( | 7 | y | ) | = | 1000 |
4 5 | y | ( | 10 | ) | + | 4 5 | × | 88 | ( | 10 | ) | − | ( | 7 | y | ) | = | 1000 |
4 5 | y | ( | 10 | ) | + | 352 5 | ( | 10 | ) | − | ( | 7 | y | ) | = | 1000 |
4 5 | y | × | 10 | + | 352 5 | ( | 10 | ) | − | ( | 7 | y | ) | = | 1000 |
| 8 | y | + | 352 5 | ( | 10 | ) | − | ( | 7 | y | ) | = | 1000 |
| 8 | y | + | 352 5 | × | 10 | − | ( | 7 | y | ) | = | 1000 |
| 8 | y | + | 704 | − | ( | 7 | y | ) | = | 1000 |
| 8 | y | + | 704 | − | 7 | y | = | 1000 |
| 1 | y | + | 704 | = | 1000 |
| 1 | y | = | 1000 | − | 704 |
| y | = | 1000 | − | 704 |
| y | = | 296 |