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- $ - 100x.{e^{ - \frac{x}{2}}} - 50{e^{ - \frac{x}{2}}} + C$
- $ - 100x.{e^{ - \frac{x}{2}}} + 200{e^{ - \frac{x}{2}}} + C$
- $ - 100x.{e^{ - \frac{x}{2}}} + 50{e^{ - \frac{x}{2}}} + C$
- $ - 100x.{e^{ - \frac{x}{2}}} - 200{e^{ - \frac{x}{2}}} + C$