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12(x⁴-1)+7x(x²+1)=0
12(x²-1)(x²+1)+7x(x²+1)=0
(x²+1)(12(x²-1)+7x)=0
(x²+1)(12x²-12+7x)=0
(x²+1)(12x²+7x-12)=0
(x²+1)=0 (12x²+7x-12)=0
brak rozw delta= 49+576=635
√delty =25
x₁=-34/24
x₂=18/24