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Triangle A B C ABC ABC是等腰, ∠ A B C = x ∘ . \angle ABC = x^{\circ}. ∠ABC=x∘.For some fixed value of x x x, the sum of the possible measures of ∠ B A C \angle BAC ∠BACis 24 0 ∘ . 240^{\circ}. 240∘.
What is x x x?
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