Mathematics

Problem

Determine all function

f

satisfying the functional relation

2f(x) + 3f\left(\frac{2007x + 150}{145x - 2007}\right) = \frac{435x^2 - 2007x + 300}{145x - 2007}, \quad \forall x \in \mathbb{R} - \left\{\frac{2007}{145}\right\}