# >< 3 Times Function Makes a Composition! ><

Algebra Level 5

A function defined from the positive integers to the positive integers satisfies $$0 < f(a) < f(b)$$ for all $$a < b$$. In addition, this function $$f$$ satisfies $$f(f(x))=3x$$. Find $f(2015)+f(2014)+f(2013)-3 f(2012) .$

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