67 1000 | ( | 41031 250 | − | y | ) | + | 57 1000 | y | = | 257009 25000 |
| Left side of the equation = | 67 1000 | × | 41031 250 | − | 67 1000 | y | + | 57 1000 | y |
| = | 2749077 250000 | − | 67 1000 | y | + | 57 1000 | y |
| = | 2749077 250000 | − | 1 100 | y |
2749077 250000 | − | 1 100 | y | = | 257009 25000 |
| - | 1 100 | y | = | 257009 25000 | − | 2749077 250000 |
| - | 1 100 | y | = | - | 178987 250000 |
178987 250000 | = | 1 100 | y |
1 100 | y | = | 178987 250000 |
| y | = | 178987 250000 | ÷ | 1 100 |
| = | 178987 250000 | × | 100 |
| = | 178987 2500 | × | 1 |
| y | = | 178987 2500 |
| y | = | 71.5948 |