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x² (x - 1) + (x -1) = 0
(x -1) (x² + 1) = 0
x -1 = 0 lub x² + 1 = 0
x = 1 sprzeczność
x^3 - x^2 +x - 1 = 0
x^2(x-1) + 1(x-1)=0
(x^2+1)(x-1)=0
x^2+1=0 x-1=0
x^2=-1 x=1
sprzeczność
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