X | ÷ | 4 | + | ( | 50 | − | X | ) | ÷ | 3 | = | 15 |
Left side of the equation = | 1 4 | X | + | 50 | × | 1 3 | − | X | × | 1 3 |
= | 1 4 | X | + | 50 3 | − | X | × | 1 3 |
= | - | 1 12 | X | + | 50 3 |
- | 1 12 | X | + | 50 3 | = | 15 |
- | 1 12 | X | = | 15 | − | 50 3 |
- | 1 12 | X | = | - | 5 3 |
5 3 | = | 1 12 | X |
1 12 | X | = | 5 3 |
X | = | 5 3 | ÷ | 1 12 |
= | 5 3 | × | 12 |
= | 5 | × | 4 |
X | = | 20 |