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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(1.5*x^3)/2+(6*x^3)/2+((1/2)*x^-1)/2 = 0
3.75*x^3+1/4*x^-1 = 0
x^-1*(3.75*x^4+1/4) = 0
3.75*x^4 = -1/4 // : 3.75
x^4 = -0.06666667
1/x = 0
1*x^-1 = 0 // : 1
x^-1 = 0
x naleu017Cy do O
x belongs to the empty set
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