| ( | 2 | a | − | 5 | ) | ÷ | 6 | + | ( | 3 | − | a | ) | ÷ | 4 | = | 1 |
| Left side of the equation = | 2 | a | × | 1 6 | − | 5 | × | 1 6 | + | ( | 3 | − | a | ) | × | 1 4 |
| = | 1 3 | a | − | 5 6 | + | ( | 3 | − | a | ) | × | 1 4 |
| = | 1 3 | a | − | 5 6 | + | 3 | × | 1 4 | − | a | × | 1 4 |
| = | 1 3 | a | − | 5 6 | + | 3 4 | − | a | × | 1 4 |
| = | 1 12 | a | − | 1 12 |
1 12 | a | − | 1 12 | = | 1 |
1 12 | a | = | 1 | + | 1 12 |
1 12 | a | = | 13 12 |
| a | = | 13 12 | ÷ | 1 12 |
| = | 13 12 | × | 12 |
| = | 13 | × | 1 |
| a | = | 13 |