| ( | 2 | + | 64 25 | ) | ÷ | 2 | × | 7 10 | X | = | 18 |
| Left side of the equation = | ( | 2 | + | 64 25 | ) | × | 7 20 | X |
| ( | 2 | + | 64 25 | ) | × | 7 20 | X | = | 18 |
| Left side of the equation = | 2 | × | 7 20 | X | + | 64 25 | × | 7 20 | X |
| = | 7 10 | X | + | 112 125 | X |
| = | 399 250 | X |
399 250 | X | = | 18 |
| X | = | 18 | ÷ | 399 250 |
| = | 18 | × | 250 399 |
| = | 6 | × | 250 133 |
| X | = | 1500 133 |
| X | = | 11.278195 |