Question: Determine the number of integer solutions to x1 + x2 + x3 + x4 = 19 where - 5 < x1 < 10 for all

Determine the number of integer solutions to x1 + x2 + x3 + x4 = 19 where - 5 < x1 < 10 for all 1 ≤ i ≤ 4.

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