3 5 | X | + | 90 | + | 60 | = | 7 5 | X | ( | 2 5 | X | + | 90 | + | 60 | ) |
| Left side of the equation = | 3 5 | X | + | 150 |
3 5 | X | + | 150 | = | 7 5 | X | ( | 2 5 | X | + | 90 | + | 60 | ) |
| Right side of the equation = | 7 5 | X | × | 2 5 | X | + | 7 5 | X | × | 90 | + | 7 5 | X | × | 60 |
| = | 14 25 | X | X | + | 126 | X | + | 84 | X |
| = | 14 25 | X | X | + | 210 | X |
3 5 | X | + | 150 | = | 14 25 | X | X | + | 210 | X |