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A C programming example of interfacing with the LINDO Callable Library that employs a Callback Function. The problem:

MAX = 20 * A + 30 * C
S.T. A + 2 * C <= 120
A <= 60
C <= 50

Solving such a problem with the LINDO Callable Library involves the following steps:

1. Create a LINDO environment.
2. Create a model in the environment.
3. Specify the model.
4. Perform the optimization.
5. Retrieve the solution.
6. Delete the LINDO environment.