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题目来源：
OG详解-OG1 数学1 Q7
正确答案：30
题目详解
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The correct answer is 30. The value of f (x) when x = 4 can be found by substituting 4 for x in the given equation f(x) = 7x+2. This yields f (4) =7 (4) + 2, or f(4) = 30 . Therefore, when x = 4, the value of f (x) is 30.
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