( | X | − | 100 | ) | ÷ | 200 | = | ( | X | − | 20 | ) | ÷ | 400 |
Left side of the equation = | X | × | 1 200 | − | 100 | × | 1 200 |
= | X | × | 1 200 | − | 1 2 |
1 200 | X | − | 1 2 | = | ( | X | − | 20 | ) | ÷ | 400 |
Right side of the equation = | X | × | 1 400 | − | 20 | × | 1 400 |
= | X | × | 1 400 | − | 1 20 |
1 200 | X | − | 1 2 | = | 1 400 | X | − | 1 20 |
1 200 | X | − | 1 400 | X | = | - | 1 20 | + | 1 2 |
1 400 | X | = | - | 1 20 | + | 1 2 |
1 400 | X | = | 9 20 |
X | = | 9 20 | ÷ | 1 400 |
= | 9 20 | × | 400 |
= | 9 | × | 20 |
X | = | 180 |