[tex]\displaystyle y^3-5y^2-y+5=0\\y^2(y-5)-(y-5)=0\\(y-5)(y^2-1)=0\\y-5=0,y^2-1=0\\y_1=-1,y_2=1,y_3=5[/tex]
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[tex]\displaystyle y^3-5y^2-y+5=0\\y^2(y-5)-(y-5)=0\\(y-5)(y^2-1)=0\\y-5=0,y^2-1=0\\y_1=-1,y_2=1,y_3=5[/tex]