x(x(125x+300)+240)+64=0;
125x^3+300x^2+240x+64=0;
(5x+4)(5x+4)(5x+4)=0;
5x+4=0 or 5x+4=0 or 5x+4=0;
x1=x2=x3= -0.8;
5x=5(-0.8)=-4
Answer: -4.
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