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Let f(x)=2x−1. If 3f(a)=15, what is the value of f(2a)?
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Let f(x)=2x−1. If 3f(a)=15, what is the value of f(2a)?

User William Martins
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The answer is 7.

f(a) = 2a-1, 3f(a) = 3(2a-1) = 15 -> a=2 so f(2a)=f(4)=7
User Crewshin
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