| ( | 400 | ÷ | 2000 | × | X | + | 6 | ) | = | ( | 6000 | ÷ | 280 | × | 30 | ) | + | ( | 26 | ÷ | X | ) | + | ( | 7 20 | ÷ | X | ) |
| 400 | ÷ | 2000 | × | X | + | 6 | = | ( | 6000 | ÷ | 280 | × | 30 | ) | + | ( | 26 | ÷ | X | ) | + | ( | 7 20 | ÷ | X | ) |
| 400 | ÷ | 2000 | × | X | + | 6 | = | 6000 | ÷ | 280 | × | 30 | + | ( | 26 | ÷ | X | ) | + | ( | 7 20 | ÷ | X | ) |
1 5 | X | + | 6 | = | 4500 7 | + | ( | 26 | ÷ | X | ) | + | ( | 7 20 | ÷ | X | ) |
1 5 | X | + | 6 | = | 4500 7 | + | 26 | ÷ | X | + | ( | 7 20 | ÷ | X | ) |
| Multiply both sides of the equation by: | X |
1 5 | X | X | + | 6 | X | = | 4500 7 | X | + | 26 | + | ( | 7 20 | ÷ | X | ) | X |
1 5 | X | X | + | 6 | X | = | 4500 7 | X | + | 26 | + | 7 20 | ÷ | X | × | X |