127 250 | ÷ | ( | 400000 | + | 17 2 | Y | ) | = | 123 250 | ÷ | ( | 500000 | + | 34 5 | Y | ) |
| 方程两边同时乘以: | ( | 400000 | + | 17 2 | Y | ) | , | ( | 500000 | + | 34 5 | Y | ) |
127 250 | ( | 500000 | + | 34 5 | Y | ) | = | 123 250 | ( | 400000 | + | 17 2 | Y | ) |
127 250 | × | 500000 | + | 127 250 | × | 34 5 | Y | = | 123 250 | ( | 400000 | + | 17 2 | Y | ) |
127 250 | × | 500000 | + | 127 250 | × | 34 5 | Y | = | 123 250 | × | 400000 | + | 123 250 | × | 17 2 | Y |
| 254000 | + | 2159 625 | Y | = | 196800 | + | 2091 500 | Y |
2159 625 | Y | − | 2091 500 | Y | = | 196800 | − | 254000 |
| - | 1819 2500 | Y | = | 196800 | − | 254000 |
| - | 1819 2500 | Y | = | - | 57200 |
| 57200 | = | 1819 2500 | Y |
1819 2500 | Y | = | 57200 |
| Y | = | 57200 | ÷ | 1819 2500 |
| = | 57200 | × | 2500 1819 |
| Y | = | 143000000 1819 |
| Y | = | 78614.623419 |