| ( | x | × | 31 | ÷ | 2 | ) | + | ( | x | × | 30 | ÷ | 13 | ) | = | 120000 |
| Left side of the equation = | x | × | 31 | ÷ | 2 | + | ( | x | × | 30 | ÷ | 13 | ) |
| = | x | × | 31 2 | + | ( | x | × | 30 | ÷ | 13 | ) |
| = | 31 2 | x | + | x | × | 30 | ÷ | 13 |
| = | 31 2 | x | + | x | × | 30 13 |
| = | 463 26 | x |
463 26 | x | = | 120000 |
| x | = | 120000 | ÷ | 463 26 |
| = | 120000 | × | 26 463 |
| x | = | 3120000 463 |
| x | = | 6738.660907 |