| 729 | ( | 4290 | a | − | 330120 | ) | = | 4290 | a | ( | 359 | − | 1 2 | a | ) | + | 69682680 |
| Left side of the equation = | 729 | × | 4290 | a | − | 729 | × | 330120 |
| = | 3127410 | a | − | 240657480 |
| 3127410 | a | − | 240657480 | = | 4290 | a | ( | 359 | − | 1 2 | a | ) | + | 69682680 |
| Right side of the equation = | 4290 | a | × | 359 | − | 4290 | a | × | 1 2 | a | + | 69682680 |
| = | 1540110 | a | − | 2145 | a | a | + | 69682680 |
| 3127410 | a | − | 240657480 | = | 1540110 | a | − | 2145 | a | a | + | 69682680 |