| ( | X | − | 199599904 5 | − | ( | ( | 9 100 | X | − | 90905421 25 | ) | ( | 1 | + | 12 100 | ) | ) | ÷ | X | ) | = | 6 100 |
| X | − | 199599904 5 | − | ( | ( | 9 100 | X | − | 90905421 25 | ) | ( | 1 | + | 12 100 | ) | ) | ÷ | X | = | 6 100 |
| Multiply both sides of the equation by: | X |
| X | X | − | 199599904 5 | X | − | ( | ( | 9 100 | X | − | 90905421 25 | ) | ( | 1 | + | 12 100 | ) | ) | = | 6 100 | X |
| X | X | − | 199599904 5 | X | − | ( | 9 100 | X | − | 90905421 25 | ) | ( | 1 | + | 12 100 | ) | = | 6 100 | X |
| X | X | − | 199599904 5 | X | − | 9 100 | X | ( | 1 | + | 12 100 | ) | + | 90905421 25 | ( | 1 | + | 12 100 | ) | = | 6 100 | X |
| X | X | − | 199599904 5 | X | − | 9 100 | X | × | 1 | − | 9 100 | X | × | 12 100 | + | 90905421 25 | ( | 1 | + | 12 100 | ) | = | 6 100 | X |
| X | X | − | 199599904 5 | X | − | 9 100 | X | − | 27 2500 | X | + | 90905421 25 | ( | 1 | + | 12 100 | ) | = | 6 100 | X |