| ( | 8300 | + | 65 | + | X | ) | × | 13 400 | = | 4 | X |
| Left side of the equation = | 8300 | × | 13 400 | + | 65 | × | 13 400 | + | X | × | 13 400 |
| = | 1079 4 | + | 169 80 | + | X | × | 13 400 |
| = | 21749 80 | + | 13 400 | X |
21749 80 | + | 13 400 | X | = | 4 | X |
13 400 | X | − | 4 | X | = | - | 21749 80 |
| - | 1587 400 | X | = | - | 21749 80 |
21749 80 | = | 1587 400 | X |
1587 400 | X | = | 21749 80 |
| X | = | 21749 80 | ÷ | 1587 400 |
| = | 21749 80 | × | 400 1587 |
| = | 21749 | × | 5 1587 |
| X | = | 108745 1587 |
| X | = | 68.522369 |