| ( | 1 | + | 2 | + | 3 | + | 4 | ) | ÷ | 5 | + | ( | 100 | ( | 19 | X | − | ( | 190 | ÷ | 20 | ) | + | 19 | X | ÷ | 20 | ) | ) | ÷ | 5 | = | 0 |
| Left side of the equation = | 1 | × | 1 5 | + | 2 | × | 1 5 | + | 3 | × | 1 5 | + | 4 | × | 1 5 | + | ( | 100 | ( | 19 | X | − | ( | 190 | ÷ | 20 | ) | + | 19 | X | ÷ | 20 | ) | ) | × | 1 5 |
| = | 1 5 | + | 2 5 | + | 3 5 | + | 4 5 | + | ( | 100 | ( | 19 | X | − | ( | 190 | ÷ | 20 | ) | + | 19 | X | ÷ | 20 | ) | ) | × | 1 5 |
| = | 2 | + | ( | 100 | ( | 19 | X | − | ( | 190 | ÷ | 20 | ) | + | 19 | X | ÷ | 20 | ) | ) | × | 1 5 |
| = | 2 | + | 100 | ( | 19 | X | − | ( | 190 | ÷ | 20 | ) | + | 19 | X | ÷ | 20 | ) | × | 1 5 |
| = | 2 | + | 20 | ( | 19 | X | − | ( | 190 | ÷ | 20 | ) | + | 19 | X | ÷ | 20 | ) |
| = | 2 | + | 20 | × | 19 | X | − | 20 | ( | 190 | ÷ | 20 | ) | + | 20 | × | 19 | X | ÷ | 20 |
| = | 2 | + | 380 | X | − | 20 | ( | 190 | ÷ | 20 | ) | + | 19 | X |
| = | 2 | + | 399 | X | − | 20 | ( | 190 | ÷ | 20 | ) |
| = | 2 | + | 399 | X | − | 20 | × | 190 | ÷ | 20 |
| = | 2 | + | 399 | X | − | 190 |
| = | - | 188 | + | 399 | X |
| - | 188 | + | 399 | X | = | 0 |
| 399 | X | = | 0 | + | 188 |
| 399 | X | = | 188 |
| X | = | 188 | ÷ | 399 |
| = | 188 | × | 1 399 |
| X | = | 188 399 |
| X | = | 0.471178 |