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x in (-oo:+oo)
x^3+(x^2)/1+x = 0
x^3+x^2+x = 0
x^3+x^2+x = 0
x*(x^2+x+1) = 0
x^2+x+1 = 0
DELTA = 1^2-(1*1*4)
DELTA = -3
DELTA < 0
x = 0
x = 0
x = 0
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