| ( | 29945571513 50 | − | X | ) | × | 1 400 | − | 5000 | − | 140320887 20 | = | X |
| Left side of the equation = | ( | 29945571513 50 | − | X | ) | × | 1 400 | − | 140420887 20 |
| ( | 29945571513 50 | − | X | ) | × | 1 400 | − | 140420887 20 | = | X |
| Left side of the equation = | 29945571513 50 | × | 1 400 | − | X | × | 1 400 | − | 140420887 20 |