| ( | X | + | 1 2 | ) | × | 6 5 | × | 3 5 | = | 63 100 |
| Left side of the equation = | ( | X | + | 1 2 | ) | × | 18 25 |
| ( | X | + | 1 2 | ) | × | 18 25 | = | 63 100 |
| Left side of the equation = | X | × | 18 25 | + | 1 2 | × | 18 25 |
| = | X | × | 18 25 | + | 9 25 |
18 25 | X | + | 9 25 | = | 63 100 |
18 25 | X | = | 63 100 | − | 9 25 |
18 25 | X | = | 27 100 |
| X | = | 27 100 | ÷ | 18 25 |
| = | 27 100 | × | 25 18 |
| = | 3 4 | × | 1 2 |
| X | = | 3 8 |
| X | = | 0.375 |