Find the sum of all the integer solutions of  $x^4 - 25x^2 + 144 = 0$.
Question:
Find the sum of all the integer solutions of  $x^4 - 25x^2 + 144 = 0$.
Answer:
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Find the sum of all the integer solutions of  $x^4 - 25x^2 + 144 = 0$.
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