( | 100 | − | x | ) | ÷ | 7 | = | ( | 180 | − | 2 | x | ) | ÷ | 12 |
Left side of the equation = | 100 | × | 1 7 | − | x | × | 1 7 |
= | 100 7 | − | x | × | 1 7 |
100 7 | − | 1 7 | x | = | ( | 180 | − | 2 | x | ) | ÷ | 12 |
Right side of the equation = | 180 | × | 1 12 | − | 2 | x | × | 1 12 |
= | 15 | − | 1 6 | x |
100 7 | − | 1 7 | x | = | 15 | − | 1 6 | x |
- | 1 7 | x | + | 1 6 | x | = | 15 | − | 100 7 |
1 42 | x | = | 15 | − | 100 7 |
1 42 | x | = | 5 7 |
x | = | 5 7 | ÷ | 1 42 |
= | 5 7 | × | 42 |
= | 5 | × | 6 |
x | = | 30 |