Math question: In triangle ABC, if angle A is congruent to angle B and side AC is congruent to side BC, what is the relationship between angles B and C?
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Math Question: Find the 3rd derivative of f(x) = 2x^5 - 3x^3 + 4x^2 - 7x + 1.
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Question: What is the solution to the equation 3x + 5 = 20, where x represents an unknown variable?