| ( | 114 | + | a | ) | ÷ | ( | 132 | + | a | ) | = | 9 10 |
| 方程两边同时乘以: | ( | 132 | + | a | ) |
| ( | 114 | + | a | ) | = | 9 10 | ( | 132 | + | a | ) |
| 114 | + | a | = | 9 10 | ( | 132 | + | a | ) |
| 114 | + | a | = | 9 10 | × | 132 | + | 9 10 | a |
| 114 | + | a | = | 594 5 | + | 9 10 | a |
| a | − | 9 10 | a | = | 594 5 | − | 114 |
1 10 | a | = | 594 5 | − | 114 |
1 10 | a | = | 24 5 |
| a | = | 24 5 | ÷ | 1 10 |
| = | 24 5 | × | 10 |
| = | 24 | × | 2 |
| a | = | 48 |