| 9000 | × | 18 | m | + | ( | 650 | + | 2 | m | ) | ( | 60 | − | m | ) | = | 39000 | + | 9000 |
| Left side of the equation = | 162000 | m | + | ( | 650 | + | 2 | m | ) | ( | 60 | − | m | ) |
| 162000 | m | + | ( | 650 | + | 2 | m | ) | ( | 60 | − | m | ) | = | 39000 | + | 9000 |
| Left side of the equation = | 162000 | m | + | 650 | ( | 60 | − | m | ) | + | 2 | m | ( | 60 | − | m | ) |
| = | 162000 | m | + | 650 | × | 60 | − | 650 | m | + | 2 | m | ( | 60 | − | m | ) |
| = | 162000 | m | + | 39000 | − | 650 | m | + | 2 | m | ( | 60 | − | m | ) |
| = | 161350 | m | + | 39000 | + | 2 | m | ( | 60 | − | m | ) |
| = | 161350 | m | + | 39000 | + | 2 | m | × | 60 | − | 2 | m | m |
| = | 161350 | m | + | 39000 | + | 120 | m | − | 2 | m | m |
| = | 161470 | m | + | 39000 | − | 2 | m | m |
| 161470 | m | + | 39000 | − | 2 | m | m | = | 39000 | + | 9000 |
| Right side of the equation = | 48000 |
| 161470 | m | + | 39000 | − | 2 | m | m | = | 48000 |