189 25 | + | X | + | ( | ( | X | ÷ | 2 | ÷ | 12 | ) | + | 63 100 | ) | × | 507 1000 | × | 12 | = | 21 |
| Left side of the equation = | 189 25 | + | X | + | ( | ( | X | ÷ | 2 | ÷ | 12 | ) | + | 63 100 | ) | × | 1521 250 |
189 25 | + | X | + | ( | ( | X | ÷ | 2 | ÷ | 12 | ) | + | 63 100 | ) | × | 1521 250 | = | 21 |
| Left side of the equation = | 189 25 | + | X | + | ( | X | ÷ | 2 | ÷ | 12 | ) | × | 1521 250 | + | 63 100 | × | 1521 250 |
| = | 189 25 | + | X | + | ( | X | ÷ | 2 | ÷ | 12 | ) | × | 1521 250 | + | 95823 25000 |
| = | 284823 25000 | + | X | + | ( | X | ÷ | 2 | ÷ | 12 | ) | × | 1521 250 |
| = | 284823 25000 | + | X | + | X | ÷ | 2 | ÷ | 12 | × | 1521 250 |
| = | 284823 25000 | + | X | + | X | × | 507 2000 |
| = | 284823 25000 | + | 2507 2000 | X |
284823 25000 | + | 2507 2000 | X | = | 21 |
2507 2000 | X | = | 21 | − | 284823 25000 |
2507 2000 | X | = | 240177 25000 |
| X | = | 240177 25000 | ÷ | 2507 2000 |
| = | 240177 25000 | × | 2000 2507 |
| = | 240177 25 | × | 2 2507 |
| X | = | 480354 62675 |
| X | = | 7.664204 |