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x⁴ (3x - 2) + (3x - 2) = 0
(x⁴ + 1)(3x - 2) = 0
x⁴ = -1 rów. sprzeczne
3x - 2 = 0
x = 2/3
15x - 8x +3x - 2 =0
10x = 2 / :
x = 0,2