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\[\begin{aligned} \max\quad &z = 2x_1 + 3x_2\\ \text{s.t.}\quad&\\ &2x_1 + x_2\leq 4\\ &x_1 + 2x_2\leq 5\\ &x_1\geq 0, x_2\geq 0. \end{aligned}\]

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