Function again

Algebra Level 2

f(2x)=3+x2+1x\large f \left(\dfrac{2}{x}\right) = \dfrac{3 + x}{ 2 + \frac{1}{x}}

What is the value of 3f(2)3f(2)?

Source : Mathematics Competition for Junior High School 2013, Forum Ilmiah Matematika Nasional Universitas Negeri Semarang .
Raihan Fauzan by Raihan Fauzan
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