1 100 | + | y | = | 149 50 | ( | 1 10 | − | y | ) | ( | 3 10 | − | y | ) |
| Right side of the equation = | 149 50 | × | 1 10 | ( | 3 10 | − | y | ) | − | 149 50 | y | ( | 3 10 | − | y | ) |
| = | 149 500 | ( | 3 10 | − | y | ) | − | 149 50 | y | ( | 3 10 | − | y | ) |
| = | 149 500 | × | 3 10 | − | 149 500 | y | − | 149 50 | y | ( | 3 10 | − | y | ) |
| = | 447 5000 | − | 149 500 | y | − | 149 50 | y | ( | 3 10 | − | y | ) |
| = | 447 5000 | − | 149 500 | y | − | 149 50 | y | × | 3 10 | + | 149 50 | y | y |
| = | 447 5000 | − | 149 500 | y | − | 447 500 | y | + | 149 50 | y | y |
| = | 447 5000 | − | 149 125 | y | + | 149 50 | y | y |
1 100 | + | y | = | 447 5000 | − | 149 125 | y | + | 149 50 | y | y |