| 12 | ÷ | 103 | + | 30 | ÷ | 200 | + | X | ÷ | 1000 | + | ( | 111 2 | − | X | ) | ÷ | 1650 | = | 3 10 |
| Left side of the equation = | 12 103 | + | 3 20 | + | X | × | 1 1000 | + | ( | 111 2 | − | X | ) | × | 1 1650 |
| = | 549 2060 | + | 1 1000 | X | + | ( | 111 2 | − | X | ) | × | 1 1650 |
549 2060 | + | 1 1000 | X | + | ( | 111 2 | − | X | ) | × | 1 1650 | = | 3 10 |
| Left side of the equation = | 549 2060 | + | 1 1000 | X | + | 111 2 | × | 1 1650 | − | X | × | 1 1650 |
| = | 549 2060 | + | 1 1000 | X | + | 37 1100 | − | X | × | 1 1650 |
| = | 17003 56650 | + | 13 33000 | X |
17003 56650 | + | 13 33000 | X | = | 3 10 |
13 33000 | X | = | 3 10 | − | 17003 56650 |
13 33000 | X | = | - | 4 28325 |
| X | = | - | 4 28325 | ÷ | 13 33000 |
| = | - | 4 28325 | × | 33000 13 |
| = | - | 4 103 | × | 120 13 |
| X | = | - | 480 1339 |
| X | = | - 0.358476 |