| 580 | × | 5 100 | + | Y | × | 98 100 | = | ( | 580 | + | Y | ) | × | 40 100 |
| Left side of the equation = | 29 | + | Y | × | 98 100 |
| 29 | + | 98 100 | Y | = | ( | 580 | + | Y | ) | × | 40 100 |
| Right side of the equation = | 580 | × | 40 100 | + | Y | × | 40 100 |
| = | 232 | + | Y | × | 40 100 |
| 29 | + | 98 100 | Y | = | 232 | + | 40 100 | Y |
98 100 | Y | − | 40 100 | Y | = | 232 | − | 29 |
29 50 | Y | = | 232 | − | 29 |
29 50 | Y | = | 203 |
| Y | = | 203 | ÷ | 29 50 |
| = | 203 | × | 50 29 |
| = | 7 | × | 50 |
| Y | = | 350 |