Consider the following optimization problem: max       x1 + 2x2              -x1 + x2 >= -4               x1 + x2 <= 15              - x1 + 3x2  <= 25                x2 >= 0  From the point (4, 0), find the optimal of the problem (P) using Simplex. In each iteration, indicate the variables that enter and leave the base.

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