x3-x2+x2-x-6x+6=0

x2(x-1)+x*(x-1)-6(x-1)=0

(x-1)*(x2+x-6)=0

(x-1)(x*(x+3)-2(x+3))=0

(x-1)(x+3)(x-2)=0

x-1=0 x=1

x+3=0 x=-3

x-2=0 x=2

Ответ x1=-3

x2=1

x3=2