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0*x-4*x^3-(30*x^2)+250 = 0
7;8;4;9;0;0
x^2*(m+1)+x*(2*m-4)-m+4 = 0
((4-2*x)/(x+1))^2-((2*(4-x))/(x+1)) = 0
2;5;3;8;0;0
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