x²(x-1)-4(x-1)=0
(x²-4)(x-1)=0
(x-2)(x+2)(x-1)=0
x1= 2, x2= -2, x3= 1
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x²(x-1)-4(x-1)=0
(x²-4)(x-1)=0
(x-2)(x+2)(x-1)=0
x1= 2, x2= -2, x3= 1