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x^2=6
x^2-6=0
(x-v6)(x+v6)=0
x=v6 v x=-v6
b)
x^2+1=0
x^2=-1
sprzeczne
c)
(3-x)x=0
x=3 v x=0
d)
(x+9)(x-1)=0
x=-9 v x=1