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Fie functiile f,g :R-R,f(x)=x+3, g(x)=2x-1. Rezolvati ecuatia 2.f(x)+3.g(x)=-5, in multimea R



Răspuns :

2(x+3)+3(2x-1)=-5
2x+6+6x-3=-5
8x+3=-5
8x=-8
x=-1