Functional Equation!

Algebra Level 5

f(x+yx)=f(x)+f(y)f(x)+2y\large{f \left( x + \dfrac{y}{x} \right ) = f(x) + \dfrac{f(y)}{f(x)} + 2y}

Let f(x):Q+Rf(x): \mathbb{Q}^+ \rightarrow \mathbb{R} be a function such that it satisfies the above functional equation for every x,yx,y belonging to the set of positive rational numbers. Then find the value of f(2015)f(2015).

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