143 10 | × | 300 | X | ( | 1119 2 | − | X | ÷ | 2 | ) | = | 75141 400 |
| Left side of the equation = | 4290 | X | ( | 1119 2 | − | X | ÷ | 2 | ) |
| 4290 | X | ( | 1119 2 | − | X | ÷ | 2 | ) | = | 75141 400 |
| Left side of the equation = | 4290 | X | × | 1119 2 | − | 4290 | X | X | ÷ | 2 |
| = | 2400255 | X | − | 2145 | X | X |
| 2400255 | X | − | 2145 | X | X | = | 75141 400 |