| ( | 6 5 | + | 200 | ÷ | 1000 | + | X | ÷ | 1650 | + | 170 | ÷ | 108 | ) | × | 1000 | = | 3 | ( | 780 | + | X | ) |
| Left side of the equation = | 6 5 | × | 1000 | + | 200 | ÷ | 1000 | × | 1000 | + | X | ÷ | 1650 | × | 1000 | + | 170 | ÷ | 108 | × | 1000 |
| = | 1200 | + | 200 | + | X | × | 20 33 | + | 42500 27 |
| = | 80300 27 | + | 20 33 | X |
80300 27 | + | 20 33 | X | = | 3 | ( | 780 | + | X | ) |
| Right side of the equation = | 3 | × | 780 | + | 3 | X |
| = | 2340 | + | 3 | X |
80300 27 | + | 20 33 | X | = | 2340 | + | 3 | X |
20 33 | X | − | 3 | X | = | 2340 | − | 80300 27 |
| - | 79 33 | X | = | 2340 | − | 80300 27 |
| - | 79 33 | X | = | - | 17120 27 |
17120 27 | = | 79 33 | X |
79 33 | X | = | 17120 27 |
| X | = | 17120 27 | ÷ | 79 33 |
| = | 17120 27 | × | 33 79 |
| = | 17120 9 | × | 11 79 |
| X | = | 188320 711 |
| X | = | 264.866385 |