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x^2 *(x+1) -9*(x+1) = 0
(x^2 - 9)(x+1) = 0
(x + 3)*(x-3)*(x+1) = 0
x1 = -3
x2 =3
x3 =-1
x²(x+1)-9(x+1)=0
(x+1)(x²-9)=0
(x+1)(x-3)(x+3)=0
x=-1 lub x=3 lub x=-3