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3x(x²+4) - (x²+4)=0
(x²+4)(3x-1)=0 ⇔ x²+4=0 lub 3x-1=0
x²+4>0 dla kazdego x∈R stad pozostaje rownanie
3x-1=0
3x=1/:3
x=1/3
Rozw. row. jest x=1/3