| ( | x | × | 12 | ÷ | 365 | ÷ | 160 | ) | × | 31 | ÷ | 2 | + | ( | x | × | 12 | ÷ | 365 | ÷ | 160 | ) | × | 30 | ÷ | 13 | = | 120000 |
| Left side of the equation = | ( | x | × | 12 | ÷ | 365 | ÷ | 160 | ) | × | 31 2 | + | ( | x | × | 12 | ÷ | 365 | ÷ | 160 | ) | × | 30 13 |
| ( | x | × | 12 | ÷ | 365 | ÷ | 160 | ) | × | 31 2 | + | ( | x | × | 12 | ÷ | 365 | ÷ | 160 | ) | × | 30 13 | = | 120000 |
| Left side of the equation = | x | × | 12 | ÷ | 365 | ÷ | 160 | × | 31 2 | + | ( | x | × | 12 | ÷ | 365 | ÷ | 160 | ) | × | 30 13 |
| = | x | × | 93 29200 | + | ( | x | × | 12 | ÷ | 365 | ÷ | 160 | ) | × | 30 13 |
| = | 93 29200 | x | + | x | × | 12 | ÷ | 365 | ÷ | 160 | × | 30 13 |
| = | 93 29200 | x | + | x | × | 9 18980 |
| = | 1389 379600 | x |
1389 379600 | x | = | 120000 |
| x | = | 120000 | ÷ | 1389 379600 |
| = | 120000 | × | 379600 1389 |
| = | 40000 | × | 379600 463 |
| x | = | 15184000000 463 |