| 20 | ÷ | 6679 50 | + | 3 | ÷ | 45 | + | X | ÷ | 447 10 | + | ( | 57 | − | X | ) | ÷ | 1000 | = | 9 20 |
| Left side of the equation = | 1000 6679 | + | 1 15 | + | X | × | 10 447 | + | ( | 57 | − | X | ) | × | 1 1000 |
| = | 21679 100185 | + | 10 447 | X | + | ( | 57 | − | X | ) | × | 1 1000 |
21679 100185 | + | 10 447 | X | + | ( | 57 | − | X | ) | × | 1 1000 | = | 9 20 |
| Left side of the equation = | 21679 100185 | + | 10 447 | X | + | 57 | × | 1 1000 | − | X | × | 1 1000 |
| = | 21679 100185 | + | 10 447 | X | + | 57 1000 | − | X | × | 1 1000 |
| = | 5477909 20037000 | + | 9553 447000 | X |
5477909 20037000 | + | 9553 447000 | X | = | 9 20 |
9553 447000 | X | = | 9 20 | − | 5477909 20037000 |
9553 447000 | X | = | 3538741 20037000 |
| X | = | 3538741 20037000 | ÷ | 9553 447000 |
| = | 3538741 20037000 | × | 447000 9553 |
| = | 3538741 6679 | × | 149 9553 |
| X | = | 527272409 63804487 |
| X | = | 8.263877 |