12 | = | X | + | 1 2 | + | ( | 37 2 | − | X | − | 1 2 | ) | ÷ | 2 |
Right side of the equation = | X | + | 1 2 | + | 37 2 | × | 1 2 | − | X | × | 1 2 | − | 1 2 | × | 1 2 |
= | X | + | 1 2 | + | 37 4 | − | X | × | 1 2 | − | 1 4 |
= | 1 2 | X | + | 19 2 |
12 | = | 1 2 | X | + | 19 2 |
- | 1 2 | X | = | 19 2 | − | 12 |
- | 1 2 | X | = | - | 5 2 |
5 2 | = | 1 2 | X |
1 2 | X | = | 5 2 |
X | = | 5 2 | ÷ | 1 2 |
= | 5 2 | × | 2 |
= | 5 | × | 1 |
X | = | 5 |