| 15 | ÷ | 4457 50 | + | 3 | ÷ | 45 | + | 30 | ÷ | 1650 | + | X | ÷ | 1000 | + | ( | 99 2 | − | X | ) | ÷ | 200 | = | 7 20 |
| Left side of the equation = | 750 4457 | + | 1 15 | + | 1 55 | + | X | × | 1 1000 | + | ( | 99 2 | − | X | ) | × | 1 200 |
| = | 186148 735405 | + | 1 1000 | X | + | ( | 99 2 | − | X | ) | × | 1 200 |
186148 735405 | + | 1 1000 | X | + | ( | 99 2 | − | X | ) | × | 1 200 | = | 7 20 |
| Left side of the equation = | 186148 735405 | + | 1 1000 | X | + | 99 2 | × | 1 200 | − | X | × | 1 200 |
| = | 186148 735405 | + | 1 1000 | X | + | 99 400 | − | X | × | 1 200 |
| = | 29452859 58832400 | − | 1 250 | X |
29452859 58832400 | − | 1 250 | X | = | 7 20 |
| - | 1 250 | X | = | 7 20 | − | 29452859 58832400 |
| - | 1 250 | X | = | - | 8861519 58832400 |
8861519 58832400 | = | 1 250 | X |
1 250 | X | = | 8861519 58832400 |
| X | = | 8861519 58832400 | ÷ | 1 250 |
| = | 8861519 58832400 | × | 250 |
| = | 8861519 1176648 | × | 5 |
| X | = | 44307595 1176648 |
| X | = | 37.655777 |