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How many integral solutions of x1 + x2 + x3 + x4 = 33 satisfy 4...

How many integral solutions of x1 + x2 + x3 + x4 = 33 satisfy 4 ≥ x1 ≥ 2, x2 ≥ 0, x3 ≥−5, and x4 ≥ 7?

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