| ( | 632 | + | a | ) | ÷ | ( | 236 | − | a | ) | = | 3 |
| Multiply both sides of the equation by: | ( | 236 | − | a | ) |
| ( | 632 | + | a | ) | = | 3 | ( | 236 | − | a | ) |
| 632 | + | a | = | 3 | ( | 236 | − | a | ) |
| 632 | + | a | = | 3 | × | 236 | − | 3 | a |
| 632 | + | a | = | 708 | − | 3 | a |
| a | + | 3 | a | = | 708 | − | 632 |
| 4 | a | = | 708 | − | 632 |
| 4 | a | = | 76 |
| a | = | 76 | ÷ | 4 |
| = | 76 | × | 1 4 |
| = | 19 | × | 1 |
| a | = | 19 |