A spring is subjected to two different forces separately. When a force of \(3 ~\text N\) is applied, the spring elongates by \(a\) units, and when a force of \(2 ~\text N\) is applied, the elongation is \(b\) units. What is the value of \((2a – 3b) \text{?}\)
1. \(5\)
2. \(0\)
3. \(7\)
4. \(9\)