8 100 | = | X | + | ( | 40 100 | × | 2 100 | ) | + | ( | 60 100 | × | 5 100 | ) |
| Right side of the equation = | X | + | 40 100 | × | 2 100 | + | ( | 60 100 | × | 5 100 | ) |
| = | X | + | 1 125 | + | ( | 60 100 | × | 5 100 | ) |
| = | X | + | 1 125 | + | 60 100 | × | 5 100 |
| = | X | + | 1 125 | + | 3 100 |
| = | X | + | 19 500 |
8 100 | = | X | + | 19 500 |
| - | X | = | 19 500 | − | 8 100 |
| - | X | = | - | 21 500 |
21 500 | = | X |
| X | = | 21 500 |