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How many integer solutions exist to the equation x1 + x2 + x3 + x4 =...

How many integer solutions exist to the equation x1 + x2 + x3 + x4 = 50, if x1 ≥ 0, x2 ≥ 2, x3 ≥ 5, and x4 ≤ 2?'

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