| ( | 6 5 | + | 250 | ÷ | 1000 | + | X | ÷ | 1650 | + | 180 | ÷ | 108 | ) | × | 1000 | = | 3 | ( | 840 | + | X | ) |
| Left side of the equation = | 6 5 | × | 1000 | + | 250 | ÷ | 1000 | × | 1000 | + | X | ÷ | 1650 | × | 1000 | + | 180 | ÷ | 108 | × | 1000 |
| = | 1200 | + | 250 | + | X | × | 20 33 | + | 5000 3 |
| = | 9350 3 | + | 20 33 | X |
9350 3 | + | 20 33 | X | = | 3 | ( | 840 | + | X | ) |
| Right side of the equation = | 3 | × | 840 | + | 3 | X |
| = | 2520 | + | 3 | X |
9350 3 | + | 20 33 | X | = | 2520 | + | 3 | X |
20 33 | X | − | 3 | X | = | 2520 | − | 9350 3 |
| - | 79 33 | X | = | 2520 | − | 9350 3 |
| - | 79 33 | X | = | - | 1790 3 |
1790 3 | = | 79 33 | X |
79 33 | X | = | 1790 3 |
| X | = | 1790 3 | ÷ | 79 33 |
| = | 1790 3 | × | 33 79 |
| = | 1790 | × | 11 79 |
| X | = | 19690 79 |
| X | = | 249.240506 |