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1/3x(27x + 1)=0
1/3x=0 v 27x+1=0
x=0 v x=-1/27
odp.
x=-1/27 v x=0
27x^2+x=0
x(27x+1)=0
x=0 lub 27x+1=0
x=0 lub x= -1/27