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oganesbagoyan
3x⁴ -4x³ -7x² +4x+4 =0 ;
x=1 корень (3 -4 -7+4+4 =0) ; 
x= -1 тоже корень(3+4 -7-4+4=0) .
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x= 2  корень  .
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(x² -1)(3x² -4x-4) =0 ;
3x² -4x-4 =0 ;
x₃ =2 ;
x₄ = -2/3.

ответ :  {-1 ; -2/3 ; 1; 2}.

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