{"problem": "Find the difference between two sets, namely ${\\pi, \\frac{17}{e}, -1, -7.23, -4} \\setminus {-1, -7.23, -7, -\\pi, -4, -13 \\log (2)}$.", "solution": " First, we need to find the union of the two sets, which is ${\\pi, \\frac{17}{e}, -1, -7.23, -4, -13 \\log (2)}$. Then we can find the difference between the union and the second set, which is ${\\pi, \\frac{17}{e}}$. 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