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1. Fie funcţia f : R --> R , f (x) = 3x+6
a. rezolvati in multimea numerelor reale ecuatia 3 x f(x)- f(1)= f(2)

2. Fie functia f : R --> R , f (x)= 2x-1 
a. reprezinta functia intr-un sistem de axe perpendiculare xOy
b. calculati suma S= f(1) + f(2) + f(3) + ... + f(25)