| 88 | + | 1 5 | ( | m | − | 150 | ) | = | 118 | + | 3 20 | ( | m | − | 200 | ) |
| Left side of the equation = | 88 | + | 1 5 | m | − | 1 5 | × | 150 |
| = | 88 | + | 1 5 | m | − | 30 |
| = | 58 | + | 1 5 | m |
| 58 | + | 1 5 | m | = | 118 | + | 3 20 | ( | m | − | 200 | ) |
| Right side of the equation = | 118 | + | 3 20 | m | − | 3 20 | × | 200 |
| = | 118 | + | 3 20 | m | − | 30 |
| = | 88 | + | 3 20 | m |
| 58 | + | 1 5 | m | = | 88 | + | 3 20 | m |
1 5 | m | − | 3 20 | m | = | 88 | − | 58 |
1 20 | m | = | 88 | − | 58 |
1 20 | m | = | 30 |
| m | = | 30 | ÷ | 1 20 |
| = | 30 | × | 20 |
| m | = | 600 |